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Genesis 21 General Notes
Special concepts in this chapter
Sarah's anger
After Sarah was able to have her own child, and he survived infancy, she began to get angry with Abraham's other son, Ishmael. He would have been a constant reminder of her own sin. God blessed Ishmael, but he was not able to inherit the promises given to Abraham. (See: rc://en/tw/dict/bible/kt/sin, rc://en/tw/dict/bible/kt/inherit, rc://en/tw/dict/bible/kt/promise and rc://en/tw/dict/bible/kt/bless)
Abandoning Ishmael
According to the law at this time, Hagar was able to gain her freedom from slavery by abandoning any claim to receive an inheritance. This is why Hagar would have abandoned her son under the tree. (See: rc://en/ta/man/translate/figs-explicit)
Treaty
The Gentile king, Abimelech, made a covenant or treaty with Abraham. It is possible that he did this because he recognized the power of Abraham's God, but his exact reasons are unknown. (See: rc://en/tw/dict/bible/kt/covenant)