Acts 7:8-9

8And God gave Abraham a covenant [a formal agreement to be strictly observed] of [which] circumcision [was the sign]; and so [under these circumstances] Abraham became the father of Isaac, and circumcised him on the eighth day; and Isaac [became the father] of Jacob, and Jacob [became the father] of the twelve patriarchs.

9“The [ten elder] patriarchs, overwhelmed with jealousy, sold [their younger brother] Joseph into [slavery in] Egypt; but God was with him,