“But you yourselves
And believers at that.”
ἀλλὰ ὑμεῖς ἀδικεῖτε καὶ ἀποστερεῖτε, καὶ τοῦτο ἀδελφούς.
Paul chastised them since they were believing brothers (καὶ τοῦτο ἀδελφούς), “You yourselves wrong (ἀλλὰ ὑμεῖς ἀδικεῖτε) and defraud (καὶ ἀποστερεῖτε) each other.” Paul was doubly upset. He was mad that believing brothers in Christ had wronged and defrauded each other. Then he was further annoyed that they could not settle it among themselves. They were fellow believers in Christ, yet they were mistreating each other and no one stepped in to solve this problem. They were defrauding each other and yet suffered no consequences. Have you ever defrauded another fellow Christian?