Isaac
Genesis 17:19-21
19
And God said, Sarah thy wife shall bear thee a son indeed; and thou shalt call his name Isaac: and I will establish my covenant with him for an everlasting covenant, and with his seed after him.
20
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.
21
But my covenant will I establish with Isaac, which Sarah shall bear unto thee at this set time in the next year.
Genesis 21:2-5
2
For Sarah conceived, and bare Abraham a son in his old age, at the set time of which God had spoken to him.
3
And Abraham called the name of his son that was born unto him, whom Sarah bare to him, Isaac.
4
And Abraham circumcised his son Isaac being eight days old, as God had commanded him.
5
And Abraham was an hundred years old, when his son Isaac was born unto him.
Genesis 21:12-5
Ishmael
Genesis 16:11-16
11
And the angel of the LORD said unto her, Behold, thou art with child, and shalt bear a son, and shalt call his name Ishmael; because the LORD hath heard thy affliction.
12
And he will be a wild man; 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.
13
And she called the name of the LORD that spake unto her, Thou God seest me: for she said, Have I also here looked after him that seeth me?
14
Wherefore the well was called Beerlahairoi; behold, it is between Kadesh and Bered.
15
And Hagar bare Abram a son: and Abram called his son's name, which Hagar bare, Ishmael.
16
And Abram was fourscore and six years old, when Hagar bare Ishmael to Abram.
Genesis 21:9
And Sarah saw the son of Hagar the Egyptian, which she had born unto Abraham, mocking.
Genesis 21:10
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, even with Isaac.