Genesis 37:2-3

These are the generations of Jacob. Joseph, being seventeen years old, was feeding the flock with his brethren; and the lad was with the sons of Bilhah, and with the sons of Zilpah, his father's wives: and Joseph brought unto his father their evil report. Now Israel loved Joseph more than all his children, because he was the son of his old age: and he made him a coat of many colours.