ESV | Genesis 22:8 Abraham said, “God will provide for himself the lamb for a burnt offering, my son.” So they went both of them together. 9 When they came to the place of which God had told him, Abraham built the altar there and laid the wood in order and bound Isaac his son and laid him on the altar, on top of the wood. 10 Then Abraham reached out his hand and took the knife to slaughter his son. 11 But the angel of the LORD called to him from heaven and said, “Abraham, Abraham!” And he said, “Here am I.” 12 He said, “Do not lay your hand on the boy or do anything to him, for now I know that you fear God, seeing you have not withheld your son, your only son, from me.” 13 And Abraham lifted up his eyes and looked, and behold, behind him was a ram, caught in a thicket by his horns. And Abraham went and took the ram and offered it up as a burnt offering instead of his son. 14 So Abraham called the name of that place, “The LORD will provide”; as it is said to this day, “On the mount of the LORD it shall be provided.” 15 And the angel of the LORD called to Abraham a second time from heaven 16 and said, “By myself I have sworn, declares the LORD, because you have done this and have not withheld your son, your only son, 17 I will surely bless you, and I will surely multiply your offspring as the stars of heaven and as the sand that is on the seashore. And your offspring shall possess the gate of his enemies, 18 and in your offspring shall all the nations of the earth be blessed, because you have obeyed my voice.”
"Who is like me? Let him make his claim! Let him announce it and explain it to me – since I established an ancient people – let them announce future events! 8 Don’t panic! Don’t be afraid! Did I not tell you beforehand and decree it? You are my witnesses! Is there any God but me? There is no other sheltering rock; I know of none." (44:7-8 ESV)If more than one divine person is being referenced then the memo must have gotten lost. Instead Yahweh speaks with singular personal pronouns, "Who is like me?....Is there any God but me?" Here Yahweh says that his hearers are "my witnesses" meaning He has testified to them concerning His Oneness. He also says "I know of none". The verb "know" here is in the perfect tense (See also Ps. 140:13, Job 42:2). It means that God does not possess information(5) about anyone else nor can He find out about anyone else. Yahweh is our rock and our salvation and there is no one beside Him. Yahweh is without distinction in His eternal nature and does not recognize or perceive any other God beside Him. Any future NT revelations are not intended to contradict this either. The singularity referenced here is "first and last" meaning it applies to all times. Therefore, no other divine person who is called God could exist. NT revelation will further show that Jesus is God and that He is the True God manifest in flesh (e.g. John 1:1, Titus 2:13, Romans 9:5, 1 Peter 1:1, 1 John 5:20, 1 Tim. 3:16). Jesus is the express image of Yahweh's being (Heb. 1:3) and we shall behold His face on that Day.
5) See Swanson, J. (1997). Dictionary of Biblical Languages with Semantic Domains : Hebrew (Old Testament) (electronic ed.). Oak Harbor: Logos Research Systems, Inc.