And he said unto them, Thus says the LORD God of Israel, Put every man his sword by his side, and go in and out from gate to gate throughout the camp, and slay every man his brother, and every man his companion, and every man his neighbor.
All Commentaries on Exodus 32:27 Go To Exodus 32
Gregory The Dialogist
AD 604
To put the sword on the thigh is to prefer the zeal for preaching to the pleasures of the flesh, so that when one is zealous for speaking of holy matters, he must be careful to overcome forbidden temptations. To go from gate to gate is to hasten with rebuke from vice to vice, whereby death enters the soul. To pass through the midst of the host is to live with such perfect impartiality within the church as to rebuke the faults of sinners and not to turn aside to favor anyone. Therefore it is properly added: “Let every man kill his brother and friend and neighbor”; that is, a man kills brother and friend and neighbor when, discovering what should be punished, he does not refrain from using the sword of reproof, even in the case of those whom he loves for his kinship with them.