"lazy gluttons" or "people who do nothing but eat too much food." This figure of speech uses the image of their stomachs to describe the whole person. (See: [[rc://en/ta/man/translate/figs-synecdoche]])
## So sharply correct them ##
"Therefore tell them strongly that they are wrong"
## that they may be sound in the faith ##
"so they will have a healthy faith" or "so they will believe the truth" or "so their faith may be true"