Bible Verses About Unity of God: God himself

Thus saith the Lord the King of Israel and his redeemer, the Lord of hostes, I am the first, and I am the last, and without me is there no God.

Feare ye not, neither be afraide: haue not I tolde thee of olde, and haue declared it? you are euen my witnesses, whether there be a God beside me, and that there is no God that I knowe not.

For thus saith the Lord (that created heauen, God himselfe, that formed the earth, and made it: he that prepared it, he created it not in vaine: he formed it to be inhabited) I am the Lord, and there is none other.

Tell ye and bring them, and let them take counsell together, who hath declared this from the beginning? or hath tolde it of olde? Haue not I the Lord? and there is none other God beside me, a iust God, and a Sauiour: there is none beside me.