And because of false brethren brought in unawares, who came in secretly to spy out our liberty which we have in Christ Jesus, that they might bring us into bondage:
All Commentaries on Galatians 2:4 Go To Galatians 2
Ambrosiaster
AD 400
By “secretly” he means that they had entered by deception, passing themselves off as brothers when they were enemies. By “slipped in” he means that they came in a humble manner, feigning friendship…. To “spy out” is to enter in such a way as to invent one thing and discover another, whereby they may challenge our liberty…. “Liberty in Jesus Christ” means not being subject to the law. “That they might bring us into bondage” means … to subject us to the law of circumcision. –.