Genesis 37:28-32
English Standard Version
29When Reuben returned to the pit and saw that Joseph was not in the pit, he tore his clothes
30and returned to his brothers and said, "The boy is gone, and I, where shall I go?"
31Then they took Joseph 's robe and slaughtered a goat and dipped the robe in the blood.
32And they sent the robe of many colors and brought it to their father and said, "This we have found; please identify whether it is your son 's robe or not."