Albert Barnes Commentary Exodus 16:3

"and the children of Israel said unto them, Would that we had died by the hand of Jehovah in the land of Egypt, when we sat by the flesh-pots, when we did eat bread to the full; for ye have brought us forth into this wilderness, to kill this whole assembly with hunger." — Exodus 16:3 (ASV)

By the hand of the Lord - This evidently refers to the plagues, especially the last, in Egypt: the death which befell the Egyptians appeared to the people preferable to the sufferings of famine.

Flesh pots, and ... bread - These expressions prove that the servile labors to which they had been subjected did not involve privations: they were fed abundantly, either by the officials of Pharaoh, or more probably by the produce of their own fertile district.