Term 1 – Week 6

Big Idea – God kept his promise to Abraham and miraculously gave him a son called Isaac.

Genesis 17:17-18; 21:1-7

Lesson Background

This unit of work is an overview of the Old Testament from creation in Genesis 1 up to God’s promise to King David in 2 Samuel 7.  The theme for the unit: God always keeps His Promises.

Then God said, ‘Yes, but your wife Sarah will bear you a son, and you will call him Isaac. I will establish my covenant with him as an everlasting covenant for his descendants after him. Genesis 17:19

In last week’s lesson we learnt that God made three big promises to Abram: Land, offspring (as many as the stars in the sky) & blessing. He didn’t live to see all these promises come true, but he believed God’s promise and put his faith in God. Abram believed the Lord, and he credited it to him as righteousness (Gen 15:6). But there was a problem. Abram didn’t have any children with his wife Sarai. When God made his promise to Abram in Genesis 12, Abram was 75yrs old and Sarai 65yrs and by the time we get to Genesis 17, Abram is 99yrs old (Sarai was 89yrs), yet there were still no children. Will God keep his promise? Is God’s promise of a nation of descendants dead before it even began?

In Genesis 17, the Lord appeared to Abram again and made an everlasting covenant with him. God promised that Abram would be the father of many nations, he would be called Abraham, future kings would come from his offspring, and the Promised Land of Canaan would belong to his descendants (vv.1-8). God also said that Sarai would now be called Sarah and together they would have a son and they are to call him Isaac (vv.15-18). But Abraham laughed. How could they bear children when they are so old?

In Genesis 18, three men visited Abraham & Sarai, they were messengers from God. Abraham was sitting at the entrance to his tent in the heat of the day when they (The Lord) appeared (v.1). Abraham hurried over to speak to the men. They asked Abraham, ‘Where is your wife, Sarah?’ He said, There, in the tent,’ (v.9). Then the Lord made this promised: ‘This time next year, and Sarah your wife will have a son’ (v.10). When Sarah heard this (for she was inside the tent listening at the entrance), she laughed to herself as she thought, ‘After I am worn out and my lord is old, will I now have this pleasure?’  (v.12). She did not believe the promise because she thought she was too old. But what God says, he does, for God always keeps his promises. In Genesis 21:1-27, we see that God’s promises are true. Sarah became pregnant and bore a son to Abraham and they called him Isaac just as the Lord commanded. Abraham was 100yrs old and Sarah was 90yrs old when Isaac was born. Isaac was the precious son of a promise, the first in the line of Abraham that would eventually bear the nation of Israel, God’s anointed Kings of the future and one day the Messiah. This excerpt alone should prompt us to marvel at the God who keeps his promises in the most unlikely of circumstances. He keeps this promise as God provides what we need. Abraham needed a son and heir, and so God brought this to happen.  


The children will understand that God kept his promise and provided Abraham and Sarah with what they need.

The children will know that the birth of Isaac was miraculous because Abraham and Sarah were so old.


Hello Song (Emu music)

Very, Very, Very Big God (EMU Music – Very, Very, Very Big God) 

Memory Verse

God said to Abraham: “I will make you into a great nation. And I will bless you. 
I will make your name great. You will be a blessing to others. 
All nations on earth will be blessed because of you.” 

Genesis 12:1-2, 3b

Leaders PDF

this has been put together using purchased external material and therefore this resource may only be used by Dundonald Church. For more information please contact natasha.small@dundonald.org

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Dundonald Kids

Dundonald Kids is the team led by our Children's Minister Natasha Small that aims to partner with parents in growing young disciples of Christ.

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