Deu 32:5 | JFB | STEP | 5. They have corrupted themselves —that is, the Israelites by their frequent lapses and their inveterate attachment to idolatry. their spot is not the spot of his children —This is an allusion to the marks which idolaters inscribe on their foreheads or their arms with paint or other substances, in various colors and forms—straight, oval, or circular, according to the favorite idol of their worship.

Deuteronomy 32:5

5. They have corrupted themselves—that is, the Israelites by their frequent lapses and their inveterate attachment to idolatry.

their spot is not the spot of his children—This is an allusion to the marks which idolaters inscribe on their foreheads or their arms with paint or other substances, in various colors and forms—straight, oval, or circular, according to the favorite idol of their worship.