Catena Aurea on Matthew 5:20–22: John Chrysostom

Or, Racha is a word signifying contempt, and worthlessness. For where we in speaking to servants or children say, Go thou, or, Tell thou him; in Syriac they would say Racha for ‘thou.’ For the Lord descends to the smallest trifles even of our behaviour, and bids us treat one another with mutual respect.