Peter knew that the Gentiles were no longer to be considered unclean (Acts 10:9-16), and he demonstrated this by eating with them. However, when some prominent Jews arrived, Peter “withdrew and separated himself, fearing them which were of the circumcision.” He knew better but allowed fear to cause him to rebel against the clear teachings of the Lord. As such, Peter “was to be blamed” (Galatians 2:11), and Paul had to rebuke him. It is one thing for a man to sin against the Lord through ignorance, but Peter knowingly, purposely, and openly violated God’s word. In like manner, believers today must bear the blame and the shame when they sin against the clear teachings of scripture.
God's children are supposed to be easily recognizable through their love one for another (John 13:35). Today's passage teaches Christians to be both kind and forgiving. In the midst of these two exemplary qualities, the Lord desires His children to show forth a tender heart. This means that our hearts ought to be easily moved when other believers are experiencing either joy or distress in their lives (Romans 12:15). Unfortunately, instead of exemplifying a tender heart, far too many believers are becoming more like the world by displaying a divisive spirit and by devouring one another (Galatians 5:15). Believers who are hard-hearted toward others are generally hard-hearted toward the Lord as well (1 John 3:17).
