Genesis 16:1

1 Now Sarai, Abram’s wife, bare him no children. And she had a handmaid, an Egyptian, whose name was Hagar.And Sarai said unto Abram, Behold now, the Lord hath restrained me from bearing; I pray thee, go in unto my maid; it may be that I may obtain children by her. And Abram hearkened unto the voice of Sarai. And Sarai, Abram’s wife, took Hagar her maid, the Egyptian, after Abram had dwelt ten years in the land of Canaan, and gave her to her husband, Abram, to be his wife. And he went in unto Hagar, and she conceived; and when she saw that she had conceived, her mistress was despised in her eyes. And Sarai said unto Abram, My wrong is upon thee; I have given my maid into thy bosom; and when she saw that she had conceived, I was despised in her eyes; the Lord judge between me and thee. But Abram said unto Sarai, Behold, thy maid is in thy hands; do to her as it pleaseth thee. And when Sarai dealt hardly with her, she fled from her face. And an angel of the Lord found her by a fountain of water in the wilderness, by the fountain in the way to Shur. And he said, Hagar, Sarai’s maid, whence comest thou, and whither wilt thou go? And she said, I flee from the face of my mistress Sarai. And the angel of the Lord said unto her, Return to thy mistress and submit thyself under her hands. And the angel of the Lord said unto her, The Lord will multiply thy seed exceedingly so that it shall not be numbered for multitude. And the angel of the Lord said unto her, Behold, thou art with child, and shalt bear a son, and shall call his name Ishmael because the Lord hath heard thy afflictions. And he will be a wild man; and his hand will be against every man, and every man’s hand against him; and he shall dwell in the presence of all his brethren. And she called the name of the angel of the Lord. And he spake unto her, saying, Knowest thou that God seest thee? And she said, I know that God seest me, for I have also here looked after him. And there was a well between Kadesh and Bered near where Hagar saw the angel. And the name of the angel was Beer-la-hai-roi; wherefore, the well was called Beer-la-hai-roi for a memorial. And Hagar bare Abram a son; and Abram called his son’s name, which Hagar bare, Ishmael. And Abram was fourscore and six years old, when Hagar bare Ishmael to Abram. 

Genesis 17:21-33

21 And God said unto Abraham, As for Sarai, thy wife, thou shalt not call her name Sarai, but Sarah thou shalt call her name. And I will bless her, and I will give thee a son of her; yea, I will bless her, and she shall be blessed, the mother of nations; kings and people shall be of her. Then Abraham fell on his face, and rejoiced, and said in his heart, There shall a child be born unto him that is a hundred years old, and Sarah that is ninety years old shall bear. And Abraham said unto God, Oh, that Ishmael might live uprightly before thee! And God said, Sarah, thy wife, shall bear thee a son, and thou shalt call his name Isaac; and I will establish my covenant with him also, for an everlasting covenant with his seed after him. And as for Ishmael, I have heard thee; behold, I have blessed him, and will make him fruitful, and will multiply him exceedingly; Twelve princes shall he beget, and I will make him a great nation. But my covenant will I establish with Isaac, whom Sarah shall bear unto thee at this set time in the next year. And he left off talking with him; and God went up from Abraham. And Abraham took Ishmael, his son, and all that were born in his house, and all that were bought with his money, every male among the men of Abraham’s house, and circumcised the flesh of their foreskin in the selfsame day, as God had said unto him. And Abraham was ninety and nine years old when he was circumcised in the flesh of his foreskin. And Ishmael was thirteen years old when he was circumcised in the flesh of his foreskin. In the selfsame day Abraham was circumcised, and Ishmael his son; and all the men of his house, which were born in his house, and bought with money of strangers, were also circumcised with him. 

Genesis 21:1-18

1 And the Lord visited Sarah as he had said, and the Lord did unto Sarah as he had spoken by the mouth of his angels; for Sarah conceived and bare Abraham a son in his old age, at the set time of which the angels of God had spoken to him. 2 And Abraham called the name of his son that was born unto him, whom Sarah bare unto him, Isaac. 3 And Abraham circumcised his son Isaac, he being eight days old, as God had commanded him. 4 And Abraham was a hundred years old when his son Isaac was born unto him. 5 And Sarah said, God has made me to rejoice; and also all that know me will rejoice with me. 6 And she said unto Abraham, Who would have said that Sarah should have given children suck? For I was barren, but the Lord promised, and I have borne unto Abraham a son in his old age. 7 And the child grew and was weaned. And the day that Isaac was weaned, Abraham made a great feast; and Sarah saw the son of Hagar, the Egyptian, which Hagar had borne unto Abraham, mocking; and she was troubled. 8 Wherefore, she said unto Abraham, Cast out this bondwoman and her son; for the son of this bondwoman shall not be heir with my son, Isaac. 9 And this thing was very grievous unto Abraham because of his son. 10 And God said unto Abraham, Let it not be grievous in thy sight because of the lad and because of thy bondwoman; in all that Sarah has said unto thee, hearken unto her voice; for in Isaac shall thy seed be called. 11 And also of the son of the bondwoman will I make a nation because he is thy seed.