Earlier on we are talking about Abraham, how he held on to the faith, that God will give him the land, although now he is staying in it as if its a foreign land. And We also learn that Abraham’s hope is in the city that is built by God. And how he willingly stayed in like a nomad all his life, living in tents. The Author of Hebrews talks about Sarah next.

Sarah early life
Sarah married Abraham when he is in the land of the Chaldean’s. (Gen 11:29-30). She was barren, unable to bear a child for Abraham. She must have been quite beautiful, as she caught the eyes of the Pharaoh(Gen 12:10-20) and Abimelech (Gen 20:1-18). The trip in Gen 12 got Sarah a maid servant called Hagar.  Sarah is 10 years younger then Abraham (Gen 17:17)

God’s promise to Abraham, and Sarah’s initial response
In Gen 15, God promised Abraham, that he will have an Offspring, (Gen 15:2-5). God promised him the following,

 5 Then He brought him outside and said, “Look now toward heaven, and count the stars if you are able to number them.” And He said to him, “So shall your descendants be.”
(Gen 15:5)

 “Know certainly that your descendants will be strangers in a land that is not theirs, and will serve them, and they will afflict them four hundred years. 14 And also the nation whom they serve I will judge; afterward they shall come out with great possessions. 15 Now as for you, you shall go to your fathers in peace; you shall be buried at a good old age. 16But in the fourth generation they shall return here, for the iniquity of the Amorites is not yet complete.”  (Gen 15:13-16)

“To your descendants I have given this land, from the river of Egypt to the great river, the River Euphrates— 19the Kenites, the Kenezzites, the Kadmonites, 20the Hittites, the Perizzites, the Rephaim, 21the Amorites, the Canaanites, the Girgashites, and the Jebusites.” (Gen 15:19-21)

Sarah initial reaction is that she must have a huge amount of unbelief in her. This is because she know for herself she is barren. Judging from the fact that Abraham left Haran at the age of 76 (Gen 12:4). And they are out in the wilderness for almost 10 years. We can guess Sarah must have passed the age of child-bearing long ago. Hence Sarah initially tried to resolve the problem by giving Hagar to Abraham, as the result, Ishmael is born to Abraham when he is 86 years old. (Gen 16:16). This resulted to war in the middle east till today 😉 .

 God’s promise to Sarah, and Sarah’s faith
God wasn’t pleased with Abraham for that matter, and only appeared to Abraham around 13 years later, when Abraham is 99 years old. (Gen 17:1). This time God promised Abraham even more, God promised that Abraham will have many descendants and God establish his covenant with the rest of the descendants of Abraham. It is a long agreement, which is recorded in (Gen 17:1-14)

God renamed Sarai (which is Sarahs former name) to Sarah, meaning a Woman of high rank or princess. God said this to Abraham “As for Sarai your wife, you shall not call her name Sarai, but Sarah shall be her name. 16 And I will bless her and also give you a son by her; then I will bless her, and she shall be a mother of nations; kings of peoples shall be from her.”  (Gen 17:15-16).

At this point Abraham started to laugh and have unbelief, but God insist on this promise. (Gen 17:17-21).

God later visited Abraham and Sarah personally to reassure them of this promise. God was en-route to destroy the city of Sodom and Gommorah then. (Gen 18:9-15).

Sarahs faith is shown here, as although the bible did not specifically mentioned. But i believe that Sarah must have the faith to begin any sexual activity with Abraham although she should be around 90 years old and have long passed child bearing age. (Gen 21:5).

What we can learn from Sarah
Sarah is just like anyone of us, sometimes when we listen to God promises made to us. We may find it ridiculous and do not have faith. There are even occasion when we try to accomplish Gods will by using our own methods (Similar to Sarah giving Hagar to Abraham).

We must learn to have faith. And we can see how God helped Sarah to built that faith. Sometimes we must understand that Gods will and ability is beyond our comprehension at times, and his orders to us may sound impossible. This is when we choose whether we can have faith or remain in unbelief.

In conclusion, Sarah faith is shown, when she received Gods assurance of a child, and she backed her faith through her actions.