Genesis 35:2 Then Jacob said unto his household, and to all that were with him, Put away the strange gods that are among you, and be clean, and change your garments: - Free Bible Online

      2. Then Jacob said unto his household . . . Put away the strange gods that are among you--Hebrew, "gods of the stranger," of foreign nations. Jacob had brought, in his service, a number of Mesopotamian retainers, who were addicted to superstitious practices; and there is some reason to fear that the same high testimony as to the religious superintendence of his household could not have been borne of him as was done of Abraham (Ge 18:19). He might have been too negligent hitherto in winking at these evils in his servants; or, perhaps, it was not till his arrival in Canaan, that he had learnt, for the first time, that one nearer and dearer to him was secretly infected with the same corruption (Ge 31:34). Be that as it may, he resolved on an immediate and thorough reformation of his household; and in commanding them to put away the strange gods, he added,
      be clean, and change your garments--as if some defilement, from contact with idolatry, should still remain about them. In the law of Moses, many ceremonial purifications were ordained and observed by persons who had contracted certain defilements, and without the observance of which, they were reckoned unclean and unfit to join in the social worship of God. These bodily purifications were purely figurative; and as sacrifices were offered before the law, so also were external purifications, as appears from the words of Jacob; hence it would seem that types and symbols were used from the fall of man, representing and teaching the two great doctrines of revealed truth--namely, the atonement of Christ and the sanctification of our nature.

JFB.