1 Corinthians 6:8
8 No, you yourselves do wrong and cheat, and you do these things to your brethren!
There is no softer way to put it, you yourselves do wrong and cheat. The word wrong is to act unjustly or wickedly. Paul uses the same word cheat, ἀποστερέω, apostereo in 1st Timothy 6:5 to refer to one who does not teach the sound doctrine, but rather has a mind destitute (apostereo) of truth. Both of these things are being done in the church to your brethren!
Remember, Paul is writing this to Christians!
“I have fed you with milk, and not with meat: for you were not able to bear it, neither yet now are you able. For you are carnal…and walk as men.” (1 Corinthians 3: 2-3)