What Does Exodus 15:12 Mean?

"You stretched out your right hand; the earth swallowed them." Verse 12 introduces "the earth" as the agent of swallowing the Egyptian army: not the sea alone but the earth itself. The "earth swallowed them" (tivla'emo aretz) is the totality statement: the sea drowning and the earth-swallowing are synonymous in the song's poetics: the enemy was swallowed by the created order under YHWH's command. The sea bed of the crossing, when the water returned, became earth that swallowed Egypt's army: the very ground that Israel walked on dry became the grave of Egypt's force.

"You stretched out your right hand" connects the sea closing to the prophetic hand-stretching of Exodus 14:27: Moses stretched out his hand over the sea, and the sea returned. The song attributes the action directly to YHWH's right hand. Moses' stretched hand is YHWH's stretched right-hand, because Moses is the agent-prophet through whom YHWH's hand operates. The prophetic arm and the divine hand are instrumentally connected: Moses stretches his arm; YHWH's right hand acts through his arm; Egypt is swallowed.

The earth-swallowing motif of verse 12 is taken up in the wilderness period when the earth literally swallows Korah, Dathan, and Abiram (Numbers 16:30-33): "if the LORD creates something new, and the ground opens its mouth and swallows them up... then you shall know that these men have despised the LORD." The earth-swallowing of the Song of the Sea becomes the template for subsequent divine-judgment-through-earth events in the wilderness period and the broader Old Testament.