When God made His promise to Abraham, since He had no one greater to swear by, He swore by Himself,

Genesis 22:16
saying, "By Myself I have sworn, declares the LORD, that because you have done this and have not withheld your only son,

Exodus 32:13
Remember Your servants Abraham, Isaac, and Israel, to whom You swore by Your very self when You declared, 'I will make your descendants as numerous as the stars in the sky, and I will give your descendants all this land that I have promised, and it shall be their inheritance forever.'"

Deuteronomy 1:8
See, I have placed the land before you. Enter and possess the land that the LORD swore He would give to your fathers Abraham, Isaac, and Jacob, and to their descendants after them."

Isaiah 45:23
By Myself I have sworn; truth has gone out from My mouth, a word that will not be revoked: Every knee will bow before Me, every tongue will swear allegiance.

Jeremiah 22:5
But if you do not obey these words, then I swear by Myself, declares the LORD, that this house will become a pile of rubble.'"

Jeremiah 44:26
Nevertheless, hear the word of the LORD, all you people of Judah living in Egypt: Behold, I have sworn by My great name, says the LORD, that never again will any man of Judah living in the land of Egypt invoke My name or say, 'As surely as the Lord GOD lives.'

Luke 1:73
the oath He swore to our father Abraham, to grant us

Galatians 3:15
Brothers, let me put this in human terms. Even a human covenant, once it is ratified, cannot be canceled or amended.

Galatians 3:18
For if the inheritance depends on the law, then it no longer depends on a promise; but God freely granted it to Abraham through a promise.

For when God made promise to Abraham, because he could swear by no greater, he swore by himself,