מדרש על דברים 12:30

..."Visiting (poked)" - visiting is always to remember. And so it states (Genesis 21:1), "And the Lord visited Sarah"; and it states (Exodus 3:16), "I will surely visit you." R. Yehudah says, "I gather together the iniquities with me, and suspend them until the fourth generation; as with Jehu, the son of Nimshi. Accordingly, it states [about him] (II Kings 15:12), "Four generations of your descendants shall occupy the throne of Israel." And so it was for him...

(Devarim 12:30) "Take heed unto yourselves": a negative commandment. "lest they be a stumbling block to you": a negative commandment.