en_tn_condensed/2pe/02/13.md

suffering harm as a reward for doing harm

"receiving what they deserve for the harm they have done"

luxury during the day

Here the word "luxury" refers to immoral activity that includes gluttony, drunkenness, and sexual activity. Doing these things during the day indicates that these people are not ashamed of this behavior.

They are stains and blemishes

"They are like stains and blemishes on clothes, which cause disgrace"