Did Abraham, Isaac, Jacob, Moses, or David believe in a Triune G-d?

Question: Did Abraham believe in one G-d?...or a triune G-d?

Answer:

Triune G-d? No

• There is not a single text in the entire Bible that supports the idea that Abraham believed in a triune G-d.

One G-d? Yes

Abraham believed in one G-d, Yahuwah Elohim:

• "And Abraham was old, and well stricken in age: and the LORD [Yahuwah] had blessed Abraham in all things." (Genesis 24:1)
• "And Abraham said unto his eldest servant of his house, that ruled over all that he had, Put, I pray thee, thy hand under my thigh: And I will make thee swear by the LORD [Yahuwah], the G-d of heaven..." (Genesis 24:2)
• "The LORD [Yahuwah] G-d of heaven, which took me from my father's house, and from the land of my kindred, and which spake unto me, and that sware unto me, saying, Unto thy seed will I give this land; he shall send his angel before thee, and thou shalt take a wife unto my son from thence." (Genesis 24:7)
• "And he said, O LORD [Yahuwah] G-d of my master Abraham, I pray thee, send me good speed this day, and shew kindness unto my master Abraham." (Genesis 24:12)
• "And he said, Blessed be the LORD [Yahuwah] G-d of my master Abraham, who hath not left destitute my master of his mercy and his truth: I being in the way, the LORD [Yahuwah] led me to the house of my master's brethren." (Genesis 24:27)

Conclusion:
Abraham and his household believed in one G-d - Yahuwah Elohim, the only true G-d.
 

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Question: Did Isaac believe in one G-d?...or a triune G-d?

Answer:

Triune G-d? No

• There is not a single text in the entire Bible that supports the idea that Isaac believed in a triune G-d.

One G-d? Yes

Isaac and his household believed in one G-d, Yahuwah:

• And Isaac intreated the LORD [Yahuwah] for his wife, because she was barren: and the LORD [Yahuwah] was intreated of him, and Rebekah his wife conceived. And the children struggled together within her; and she said, If it be so, why am I thus? And she went to enquire of the LORD [Yahuwah]. And the LORD [Yahuwah] said unto her, Two nations are in thy womb, and two manner of people shall be separated from thy bowels; and the one people shall be stronger than the other people; and the elder shall serve the younger. (Genesis 25:21-23)
• And Isaac said unto his son, How is it that thou hast found it so quickly, my son? And he said, Because the LORD [Yahuwah] thy G-d brought it to me. (Genesis 27:20)

Conclusion:
Isaac and his household believed in one G-d, Yahuwah Elohim, the G-d of Abraham.
 

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Question: Did Jacob believe in one G-d?...or a triune G-d?

Answer:

Triune G-d? No

• There is not a single text in the entire Bible that supports the idea that Jacob believed in a triune G-d.

One G-d? Yes

Jacob and his household believed in one G-d, Yahuwah Elohim:

• And he dreamed, and behold a ladder set up on the earth, and the top of it reached to heaven: and behold the angels of G-d ascending and descending on it. And, behold, the LORD [Yahuwah] stood above it, and said, I am the LORD [Yahuwah] G-d of Abraham thy father, and the G-d of Isaac: the land whereon thou liest, to thee will I give it, and to thy seed. (Gen 28:12-13)
• And Jacob awaked out of his sleep, and he said, Surely the LORD [Yahuwah] is in this place; and I knew it not. (Gen 28:16)
• So that I come again to my father's house in peace; then shall the LORD [Yahuwah] be my G-d. (Gen 28:21)
• And Jacob said, O G-d of my father Abraham, and G-d of my father Isaac, the LORD [Yahuwah] which saidst unto me, Return unto thy country, and to thy kindred, and I will deal well with thee. (Genesis 32:9)

Conclusion:
Jacob and his household believed in one G-d, Yahuwah Elohim, the G-d of Abraham and Isaac, his fathers.
 

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Question: Did David believe in one G-d?...or a triune G-d?

Answer:

Triune G-d? No

• There is not a single text in the entire Bible that supports the idea that David believed in a triune G-d.

One G-d? Yes

David, the king of Israel, believed in only one true G-d, Yahuwah Elohim. And not only David, but all of Israel, too.

• Then said David to the Philistine, Thou comest to me with a sword, and with a spear, and with a shield: but I come to thee in the name of the LORD [Yahuwah] of hosts, the G-d of the armies of Israel, whom thou hast defied. (1 Samuel 17:45)
   
• And Jonathan said unto David, O LORD G-d [Yahuwah Elohim] of Israel, when I have sounded my father about to morrow any time, or the third day, and, behold, if there be good toward David, and I then send not unto thee, and shew it thee; (1 Samuel 20:12)

Yahuwah was the G-d of Israel:

• The LORD [Yahuwah] do so and much more to Jonathan: but if it please my father to do thee evil, then I will shew it thee, and send thee away, that thou mayest go in peace: and the LORD [Yahuwah] be with thee, as he hath been with my father. (1 Samuel 20:13)
• Then said David, O LORD G-d [Yahuwah Elohim] of Israel, thy servant hath certainly heard that Saul seeketh to come to Keilah, to destroy the city for my sake. (1 Samuel 23:10)
• And David said to Abigail, Blessed be the LORD G-d [Yahuwah Elohim] of Israel, which sent thee this day to meet me: (1 Samuel 25:32)
• And David was greatly distressed; for the people spake of stoning him, because the soul of all the people was grieved, every man for his sons and for his daughters: but David encouraged himself in the LORD [Yahuwah] his G-d.
• So do G-d to Abner, and more also, except, as the LORD [Yahuwah] hath sworn to David, even so I do to him; (2 Samuel 3:9)
• And David went on, and grew great, and the LORD G-d [Yahuwah Elohim] of hosts was with him. (2 Samuel 5:10)

Conclusion:
King David believed in the one true G-d, Yahuwah Elohim of hosts.
 

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Question: Did Moses believe in one G-d?...or a triune G-d?

Answer:

Triune G-d? No

• There is not a single text in the entire Bible that supports the idea that Moses believed in a triune G-d.

One G-d? Yes

Moses was the one who was called to lead the Israelites out of Egypt. It was very important that they did not forget the G-d of their fathers. Note what Yahuwah said to Moses: "And G-d said moreover unto Moses, Thus shalt thou say unto the children of Israel, The LORD G-d [Yahuwah Elohim] of your fathers, the G-d of Abraham, the G-d of Isaac, and the G-d of Jacob, hath sent me unto you: this is my name for ever, and this is my memorial unto all generations. (Exodus 3:15)

• G-d of Abraham
• G-d of Isaac
• G-d of Jacob

And who was their G-d? Yahuwah Elohim, the only true G-d of Israel.

• Go, and gather the elders of Israel together, and say unto them, The LORD G-d [Yahuwah Elohim] of your fathers, the G-d of Abraham, of Isaac, and of Jacob, appeared unto me, saying, I have surely visited you, and seen that which is done to you in Egypt: (Exodus 3:16)
   
• And they shall hearken to thy voice: and thou shalt come, thou and the elders of Israel, unto the king of Egypt, and ye shall say unto him, The LORD G-d [Yahuwah Elohim] of the Hebrews hath met with us: and now let us go, we beseech thee, three days' journey into the wilderness, that we may sacrifice to the LORD our G-d [Yahuwah our Elohim]. (Exodus 3:18)
   
• And Moses said unto the LORD [Yahuwah], O my Lord, I am not eloquent, neither heretofore, nor since thou hast spoken unto thy servant: but I am slow of speech, and of a slow tongue. (Exodus 4:10)
   
• That the LORD [Yahuwah] spake unto Moses, saying, I am the LORD [Yahuwah]: speak thou unto Pharaoh king of Egypt all that Isay unto thee. (Exodus 6:29)
   
• And G-d said unto Moses, I AM THAT I AM (hayah asher hayah): and he said, Thus shalt thou say unto the children of Israel, I AM hath sent me unto you. (Exodus 3:14)

Conclusion:
Moses also believed in and experienced the only true G-d of Abraham, Isaac, and Jacob - Yahuwah, Elohim of the Hebrews, the heavenly Father, the I AM that I AM.
 

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LORD = Yahuwah (H3068); Yahuwah = the proper name of the one true G-d
https://www.blueletterbible.org/lang/lexicon/lexicon.cfm?Strongs=H3068&t=KJV