New King James Version (NKJV)
Genesis 17
21 But My covenant I will establish with Isaac, whom Sarah shall bear to you at this set time next year."
22 Then He finished talking with him, and God went up from Abraham.
23 So Abraham took Ishmael his son, all who were born in his house and all who were bought with his money, every male among the men of Abraham’s house, and circumcised the flesh of their foreskins that very same day, as God had said to him.
24 Abraham was ninety-nine years old when he was circumcised in the flesh of his foreskin.
25 And Ishmael his son was thirteen years old when he was circumcised in the flesh of his foreskin.
26 That very same day Abraham was circumcised, and his son Ishmael;
27 and all the men of his house, born in the house or bought with money from a foreigner, were circumcised with him.
Genesis 18
1 Then the Lord appeared to him by the terebinth trees of Mamre, as he was sitting in the tent door in the heat of the day.
2 So he lifted his eyes and looked, and behold, three men were standing by him; and when he saw them, he ran from the tent door to meet them, and bowed himself to the ground,
3 and said, "My Lord, if I have now found favor in Your sight, do not pass on by Your servant.
4 Please let a little water be brought, and wash your feet, and rest yourselves under the tree.