What Does Exodus 15:24 Mean?

And the people grumbled against Moses, saying, "What shall we drink?" The grumbling pattern inaugurated during the sea crisis (Exodus 14:11-12) continues immediately at Marah: the people grumble against Moses. "What shall we drink?" is the exact practical expression of the wilderness dependence test: without YHWH's provision, there is nothing to drink. The water is bitter; Egypt is far behind; there is no engineering solution. The grumbling is the human reflex of people with no options facing an immediate survival threat: not primarily moral failure but existential fear expressed as complaint directed at the available human authority figure.

The grumbling "against Moses" positions Moses as YHWH's representative who is answerable for YHWH's provisions: when YHWH doesn't provide water, Moses gets the complaint. The pattern will be repeated throughout the wilderness period (Exodus 16:2-3; 17:2-3; Numbers 14:2-4; 20:3-5): Israel grumbles to/against Moses when YHWH's provision is not yet visible. The grumble-to-Moses pattern is not indifference to YHWH but the appropriate direction of complaint toward the covenant mediator who has accountability for the community's welfare under YHWH's governance.

Paul's use of the Marah-type wilderness grumbling in 1 Corinthians 10:10: "nor grumble, as some of them did and were destroyed by the Destroyer": shows the grumbling pattern's ongoing theological significance: the wilderness grumbling is the negative pattern that the New Testament community is warned against. The grumbling against Moses at Marah is the beginning of a trajectory that ends (in Numbers 11, 14, 16, 20) in the covenant consequences of sustained unbelief-grumbling. The "what shall we drink?" at Marah is the first step on that trajectory.