en_tn/2sa/22/43.md

like dust on the ground ... like mud in the streets

This means that David completely destroyed his enemies. These two phrases "like dust on the ground" and "like mud on the streets" have a similar meaning and are used for emphasis. (See: rc://en/ta/man/jit/figs-simile and rc://en/ta/man/jit/figs-parallelism)