Parallel
Psalms 49:20
Swete's Septuagint · Berean Standard Bible
καθήμενος κατὰ τοῦ ἀδελφοῦ σου κατελάλεις, καὶ κατὰ τοῦ υἱοῦ τῆς μητρός σου ἐτίθεις σκάνδαλον.
50:20
You sit and malign your brother; you slander your own mother’s son.