Genesis 15:16; Genesis 21:23; Genesis 21:29

16 But in the fourth generation they shall come hither again: for the iniquity of the Amorites is not yet full.

23 Now therefore swear unto me here by God that thou wilt not deal falsely with me, nor with my son, nor with my son's son: but according to the kindness that I have done unto thee, thou shalt do unto me, and to the land wherein thou hast sojourned.

29 And Abimelech said unto Abraham, What mean these seven ewe lambs which thou hast set by themselves?