Rashi on Deuteronomy 32:38/רש"י על דברים ל״ב:ל״ח

1אשר חלב זבחימו THE FAT OF WHOSE SACRIFICES THEY, i.e. these gods — used to eat, which they offered to them, and which used to drink יין נסיכם THE WINE OF THEIR DRINK OFFERING.

2יהי עליכם סתרה LET IT BE YOUR PROTECTION — i.e., let that rock (v. 37) be a refuge and shelter to you.