Sarah was Abraham’s wife and was also his half-sister. On two occasions, to save himself from possible danger, Abraham said that Sarah was his “sister,” failing to mention that she was also his wife. After many years of not being able to bear children, Sarah encouraged Abraham to start a family with her maidservant, Hagar. This plan backfired when, upon conceiving, Hagar became condescending toward Sarah. Later, God promised Abraham that he would give him a son through Sarah. Since she was 90 years old at the time, and Abraham himself was 100, Sarah’s initial response to the promise was laughter. However, one year later, Sarah gave birth to Isaac, the child of promise. She thus became an ancestor of Christ. (Genesis 17:15–16)