Clinging is a slightly unexpected word here. We might more typically expect something like following or loving or obeying — we just had going after used a verse earlier to talk about following other g-ds, and elsewhere in this very parashah, we get, in short succession, the Shəma’s iconic insistence on obedience and the Və’ahavta’s command to love. But here we get none of those and find clinging instead. Which is a little odd, since Dəvarim is normally so insistent on an intangible, non-material G-d. How do you hold fast to something that has no substance?