What did the dying Jacob make Joseph promise?

Answer: Not to bury him in Egypt

"Do not bury me in Egypt," Jacob said, but "carry me out of Egypt and bury me with them." Joseph swore to do it.

“When the time drew near for Israel to die, he called his son Joseph and said to him, “If I have found favor in your eyes, put your hand under my thigh and promise to show me kindness and faithfulness. Do not bury me in Egypt,”— Genesis 47:29 (BSB)