They say = [It is a common] saying. Reference to Pentateuch (Deu_24:1-4).
yet return again to Me = yet [thinkest thou to] return, &c. It was contrary to the law of Deu_24:1-4. It will be the new Israel of Mat_21:43 of a yet future day. God never mends what man has marred. This is the lesson of the potter's house. See Jer_18:1-4.