Zephaniah 1:5

The Lord would also judge those who worshipped the sun, moon, stars, and planets, which the idolatrous Israelites did on their flat housetops (cf. Deuteronomy 4:19; 2 Kings 21:3; 2 Kings 21:5; 2 Kings 23:4-5; Jeremiah 19:13). He would also punish the Judeans who worshipped both Yahweh and the pagan gods of the nations (cf. 2 Kings 16:3; 2 Kings 21:6; Jeremiah 32:35). "Milcom," (Molech, the god of Ammon; 1 Kings 11:33), probably represents all foreign gods. Swearing to and by a deity meant pronouncing an oath that called on that god to punish the oath-taker if he or she failed to do what he or she promised. Swearing by another god involved acknowledging its authority, which God forbade in Israel.