Rashi on Deuteronomy 29:16/רש"י על דברים כ״ט:ט״ז

1ותראו את שקוציהם AND YE HAVE SEEN THEIR ABOMINABLE THINGS — Idols are so termed because they are loathsome like unclean things that are held in abomination.

2גלליהם THEIR IDOLS — thus termed because they are detestable (lit., malodorous) and loathsome like dung (גלל).

3עץ ואבן [AND YE HAVE SEEN … THEIR IDOLS] WOOD AND STONE — Those of wood and stone you have seen exposed openly, because the heathen was not afraid lest they might be stolen; those of gold and silver, however, ARE WITH THEM (עמהם), in their “marbled halls” (cf. Rashi on Ezekel 8:12 whence he borrowed this expression), because they were afraid they might be stolen (Midrash Tanchuma, Nitzavim 3).