Sharper Iron — In the Beginning – Genesis 21:1-21: The Child of Promise

https://kfuo-od.streamguys1.com/recast/sharper-iron/20260223104737-2026-02-23_SI.mp3
Download Audio File

The LORD keeps the promise He has been repeating for twenty-five years when Isaac is conceived and born to Abraham and Sarah. Although Isaac’s name does recall his parents’ laughter at God’s promises, his name also serves as a reminder of the joy at God’s gift. After Isaac is weaned, conflict arises when Sarah sees Ishmael laughing. The LORD tells Abraham that it is right to send Ishmael away because the LORD will name Abraham’s offspring through Isaac. Still, the LORD takes care of Hagar and Ishmael and keeps the promise He made concerning Ishmael previously.

Rev. Ryan Ogrodowicz, pastor at Grace Lutheran Church and School in Brenham, TX, joins host Rev. Timothy Appel to study Genesis 21:1-21.

To learn more about Grace Lutheran, visit gracebrenham.org.

“In the Beginning” is a series on Sharper Iron that studies Genesis. The first book of Moses sets the stage for God’s entire story of salvation. As we learn the beginning of the story, God prepares us to receive the fulfillment of the story: Jesus Christ, the Offspring of the woman who has crushed our enemy’s head.

Sharper Iron, hosted by Rev. Timothy Appel, looks at the text of Holy Scripture both in its broad context and its narrow detail, all for the sake of proclaiming Christ crucified and risen for sinners. Two pastors engage with God’s Word to sharpen not only their own faith and knowledge, but the faith and knowledge of all who listen. Submit comments or questions to: listener@kfuo.org

Sharper Iron is underwritten by Lutheran Church Extension Fund. Together in faith, LCEF helps to start, sustain and strengthen LCMS ministries through financial and strategic partnerships. Visit lcef.org.

Genesis 21:1-21

The Birth of Isaac

21 The Lord visited Sarah as he had said, and the Lord did to Sarah as he had promised. 2 And Sarah conceived and bore Abraham a son in his old age at the time of which God had spoken to him. 3 Abraham called the name of his son who was born to him, whom Sarah bore him, Isaac.[a] 4 And Abraham circumcised his son Isaac when he was eight days old, as God had commanded him. 5 Abraham was a hundred years old when his son Isaac was born to him. 6 And Sarah said, “God has made laughter for me; everyone who hears will laugh over me.” 7 And she said, “Who would have said to Abraham that Sarah would nurse children? Yet I have borne him a son in his old age.”

God Protects Hagar and Ishmael

8 And the child grew and was weaned. And Abraham made a great feast on the day that Isaac was weaned. 9 But Sarah saw the son of Hagar the Egyptian, whom she had borne to Abraham, laughing.[b] 10 So she said to Abraham, “Cast out this slave woman with her son, for the son of this slave woman shall not be heir with my son Isaac.” 11 And the thing was very displeasing to Abraham on account of his son. 12 But God said to Abraham, “Be not displeased because of the boy and because of your slave woman. Whatever Sarah says to you, do as she tells you, for through Isaac shall your offspring be named. 13 And I will make a nation of the son of the slave woman also, because he is your offspring.” 14 So Abraham rose early in the morning and took bread and a skin of water and gave it to Hagar, putting it on her shoulder, along with the child, and sent her away. And she departed and wandered in the wilderness of Beersheba.

15 When the water in the skin was gone, she put the child under one of the bushes. 16 Then she went and sat down opposite him a good way off, about the distance of a bowshot, for she said, “Let me not look on the death of the child.” And as she sat opposite him, she lifted up her voice and wept. 17 And God heard the voice of the boy, and the angel of God called to Hagar from heaven and said to her, “What troubles you, Hagar? Fear not, for God has heard the voice of the boy where he is. 18 Up! Lift up the boy, and hold him fast with your hand, for I will make him into a great nation.” 19 Then God opened her eyes, and she saw a well of water. And she went and filled the skin with water and gave the boy a drink. 20 And God was with the boy, and he grew up. He lived in the wilderness and became an expert with the bow. 21 He lived in the wilderness of Paran, and his mother took a wife for him from the land of Egypt.

Read full chapter

Footnotes

Genesis 21:3 Isaac means he laughs

Genesis 21:9 Possibly laughing in mockery

English Standard Version (ESV)

The ESV® Bible (The Holy Bible, English Standard Version®), © 2001 by Crossway, a publishing ministry of Good News Publishers.