Hebrews 6:14

11 And it is our desire that you may all keep the same high purpose in certain hope to the end:

12 So that you may not be slow in heart, but may take as your example those to whom God has given their heritage, because of their faith and their long waiting.

13 For when God made his oath to Abraham, because there was no greater oath, he made it by himself,

14 Saying, Be certain that I will give you my blessing, and make your numbers very great.

15 And so, when he had been waiting calmly for a long time, God's word to him was put into effect.

16 For men at all times make their oaths by what is greater; and any argument is ended by the decision of the oath.

17 So that when it was God's desire to make it specially clear to those who by his word were to have the heritage, that his purpose was fixed, he made it more certain with an oath;