Genesis 23:16

23:16 So Abraham agreed to Ephron’s price and weighed out for him the price that Ephron had quoted in the hearing of the sons of Heth – 400 pieces of silver, according to the standard measurement at the time.

Genesis 37:27

37:27 Come, let’s sell him to the Ishmaelites, but let’s not lay a hand on him, for after all, he is our brother, our own flesh.” His brothers agreed.