Likutei Moharan 22:15/ליקוטי מוהר"ן כ״ב:ט״ו

115. This is (Deuteronomy 7:12), “Ekev (In the end), if you will listen to these laws.” “Ekev” corresponds to the feet. And feet is synonymous with those who rebuke, as mentioned above. The judgments are revealed to them, and they rebuke the generation. Thus “Ekev (the heel), if you will listen.” That is, from the concept of the feet/those who rebuke, “you will listen to these laws”—the judgments. For they are revealed to them, and with this they rebuke the generation.