Cruelty of Sarah to Hagar
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Genesis 16:6
“Here,” said Abram, “your servant is in your hands. Do whatever you want with her.” Then Sarai treated Hagar so harshly that she fled from her.
Genesis 21:9–14
But Sarah saw that the son whom Hagar the Egyptian had borne to Abraham was mocking her son, / and she said to Abraham, “Expel the slave woman and her son, for the slave woman’s son will never share in the inheritance with my son Isaac!” / Now this matter distressed Abraham greatly because it concerned his son Ishmael.