Albert Barnes Commentary Deuteronomy 11:6

"and what he did unto Dathan and Abiram, the sons of Eliab, the son of Reuben; how the earth opened its mouth, and swallowed them up, and their households, and their tents, and every living thing that followed them, in the midst of all Israel:" — Deuteronomy 11:6 (ASV)

Literally, "every living thing at their feet". The expression does not mean their goods, which would be included in their "households and tents," but their followers (Numbers 16:32).