Genesis 17:2
I will establish My covenant between Me and you, and I will multiply you exceedingly."

Genesis 22:16, 17
saying, "By Myself I have sworn, declares the LORD, that because you have done this and have not withheld your only son, . . .

Genesis 26:3
Stay in this land as a foreigner, and I will be with you and bless you. For I will give all these lands to you and your offspring, and I will confirm the oath that I swore to your father Abraham.

Genesis 28:13
And there at the top the LORD was standing and saying, "I am the LORD, the God of your father Abraham and the God of Isaac. I will give you and your descendants the land on which you now lie.

Genesis 35:11
And God told him, "I am God Almighty. Be fruitful and multiply. A nation--even a company of nations--shall come from you, and kings shall descend from you.

Nehemiah 9:8
You found his heart faithful before You, and made a covenant with him to give the land of the Canaanites and Hittites, of the Amorites and Perizzites, of the Jebusites and Girgashites, to give it to his descendants. You have kept Your promise, because You are righteous.

Acts 7:8
Then God gave Abraham the covenant of circumcision, and Abraham became the father of Isaac and circumcised him on the eighth day. And Isaac became the father of Jacob, and Jacob of the twelve patriarchs.

Hebrews 6:17
So when God wanted to make the unchanging nature of His purpose very clear to the heirs of the promise, He guaranteed it with an oath.