C. F. Keil and Franz Delitzsch on Jeremiah 3:7

Jer 3:7

And I said, sc. to myself, i.e., I thought. A speaking by the prophets (Rashi) is not to be thought of; for it is no summons, turn again to me, but only the thought, they will return. It is true that God caused backsliding Israel to be ever called again to repentance by the prophets, yet without effect. Meantime, however, no reference is made to what God did in this connection, only Israel’s behaviour towards the Lord being here kept in view. The Chet. ותּראה is the later usage; the Keri substitutes the regular contracted form ותּרא. The object, it (the whoredom of Israel), may be gathered from what precedes.