en_tn_lite_do_not_use/deu/32/21.md

Moses speaks a poetic song to the people of Israel. Moses continues to use parallelism to emphasize what he is saying. (See: rc://en/ta/man/translate/figs-parallelism)

They have made me jealous

Here "me" refers to Yahweh.

by those who are not a people...a nation that has no understanding

Both of these refer to a non-Jewish nation that does not know Yahweh.