Albert Barnes Commentary Psalms 78:19

"Yea, they spake against God; They said, Can God prepare a table in the wilderness?" — Psalms 78:19 (ASV)

Yea, they spake against God - That is, in the manner which is immediately specified: by calling in question his power, or his ability to provide for them in the wilderness. See Numbers 11:4.

They said, Can God furnish a table in the wilderness? - In the desert. The word rendered “furnish” is, in the margin, “order.” It means to arrange; to set in order; and here, to arrange and provide for, as at a feast. The precise words used by the complaining Hebrews are not quoted here, but the substance of what they said is retained. The idea is that what they spoke was “equivalent” to saying that God could not prepare a table for them; that is, provide for them, in the desert.