What does Genesis 37:22 mean?
The oldest of Joseph's ten brothers is attempting to save Joseph's life from their murderous rage. The rest of his brothers have described a plan to kill Joseph and report that he was eaten by a wild animal (Genesis 37:18–20). Reuben says no (Genesis 37:21). His hope is that by preventing Joseph from being killed outright, he can rescue him and present Jacob's favorite son, safe and sound (Genesis 37:3).Perhaps Reuben hopes that by saving Joseph, he will regain the favor he lost when he slept with his father's concubine (Genesis 35:22). This would be a poignant echo of his mother's own hopes; Leah had dreamed that by bearing a son to Jacob, she would be loved (Genesis 29:31–32). Or maybe he just wants to do the right thing.
In either case, Reuben urges his brothers to throw Joseph into a dry cistern (Genesis 37:24) without hurting him. His brothers likely believe he is suggesting they leave Joseph in the pit to die in the wilderness. In that way, they can deceptively claim they did not "kill" Joseph. Reuben's real plan is to come back and free Joseph, to return him to their father.