Hebrews 6:13-17

13God made a promise to Abraham. Since he had no one greater on whom to base his oath, he based it on himself.

14He said, “I will certainly bless you and give you many descendants.”

15So Abraham received what God promised because he waited patiently for it.

16When people take oaths, they base their oaths on someone greater than themselves. Their oaths guarantee what they say and end all arguments.

17God wouldn’t change his plan. He wanted to make this perfectly clear to those who would receive his promise, so he took an oath.