Charles H. Spurgeon on Psalms 141:4

Let me not eat of their dainties. Sin is not only meat, but sweet meat, not only bread, but pleasant bread to an evil heart. Daniel for some weeks ate no pleasant bread; he ate bread to keep life and soul together, but he forbare feasting or good cheer. Sin is a feast to a carnal man, it is his good cheer, yea, it is "dainties" to him. David, speaking of wicked men, says, Incline not my heart to any evil thing, to practise wicked works with men that work iniquity: and let me not eat of their dainties. These "dainties" may be expounded either for the prosperity that comes in by wicked practices (some by wicked ways get not only their ordinary food but "dainties"); or those "dainties" are sin itself: they feasted themselves in doing evil: "Lord, let me not eat of their dainties." If that be their food I had rather starve than eat with them. —Joseph Caryl.