Jeremiah 50:2

The Lord commanded a proclamation among the nations that Babylon would be captured. Her chief idols, Bel and Marduk, as well as all her gods, would be humiliated, since it was their job to protect Babylon. [Note: See John D. W. Watts, "Babylonian Idolatry in the Prophets As a False Socio-Economic System," in Israel’s Apostasy and Restoration: Essays in Honor of Roland K. Harrison, pp. 118-20.] Bel was the title of the storm god Enlil, the chief god of Nippur. He was the equivalent of Baal in Canaan and Hadad in Aram. The Babylonians also called Marduk "Bel." [Note: Smothers, p. 365.] Marduk (Merodach) was the creator god who emerged as Babylon’s chief deity and the head of the pantheon of Babylonian idols. Jeremiah used Bel and Marduk in this verse to represent all the Babylonian gods. He referred to their images as pieces of human excrement (Heb. gilluleyha, "her idols"; cf. Leviticus 26:30; Deuteronomy 29:17; 1 Kings 15:12; 1 Kings 21:26; et al.). Ezekiel used this Hebrew word to describe idols no less than 38 times.

"In the spirit Jeremiah sees the fall of Babylon, together with its idols, as if it had actually taken place, and gives the command to proclaim among the nations this event, which brings deliverance for Israel and Judah." [Note: Keil, 2:269.]