Genesis 37:31

They took Joseph’s coat. Though Reuben was beside himself with grief and perplexity, his ruthless and unrelenting brothers were at no loss for a plan. Apparently, however, they had neither the brazen boldness to carry through their scheme in person nor the courage to witness their father’s first outburst of grief. Hence they arranged for another, probably a slave, who knew nothing more of the matter than what he was told, and so could not reveal their dark secret, to carry the bloody coat to Jacob in Hebron.