Genesis 21:1-21 recounts the birth of Isaac, the fulfillment of the promise made to Abraham and Sarah, and also the separation between Ishmael and Hagar. Read the full text here.

Text Structure

Gen 21:1-7

The fulfillment of the promise. Isaac is born at the time appointed by God, bringing joy to Sarah and confirming divine faithfulness.

Gen 21:8-10

The conflict in the family. Ishmael mocks Isaac, creating tension and leading Sarah to ask for the separation of Hagar and her son.

Gen 21:11-13

God’s guidance. God instructs Abraham to comply with Sarah’s request, reaffirming that the promise would continue through Isaac (divine provision), and not through Ishmael (human provision).

Gen 21:14-16

The distress in the wilderness. Abraham sends Hagar and Ishmael away. In the wilderness, they face scarcity and despair, with no resources to survive.

Gen 21:17-19

The divine help. God hears the cry and provides water, demonstrating care even outside the line of the promise.

Gen 21:20-21

The new beginning. Ishmael grows and follows his path, with God accompanying his life and fulfilling the promise to make him a great nation, because he is Abraham’s son.

Additional Literature

As a complement to the theme addressed in Genesis 21:1-21, the following reading is recommended:

Patriarchs and Prophets, chapter 13 - “The Test of Faith”

Reflection

Genesis 21 shows that God fulfills His promises at the right time. The birth of Isaac was not just a family event, but the confirmation that what God declares comes to pass, even when it seems impossible.

At the same time, the chapter reveals the consequences of hasty human decisions. The story of Hagar and Ishmael shows that choices outside of God’s will can bring pain, but do not cancel His care.

God not only fulfills promises, but also demonstrates mercy. Even in the midst of conflicts and separations, He hears, sees, and provides, showing that His grace reaches all who cry out to Him.