Luke 22:31-32
"Simon, Simon [i.e., Peter], Satan has earnestly requested the right to sift you like wheat. [Note: Grain was sifted by using a sieve-like device in which grain and particles of dirt and straw were shaken together, allowing the grain to fall through while the dirt and straw remained. This was an allusion to the agitating trials Peter was soon to endure, and survive].
Galatians 2:11-14
But when Cephas came to Antioch [of Syria], I confronted him personally [about a matter] for which he deserved to be condemned.
Galatians 6:1
Brothers, if any one of you is overwhelmed by a [particular] sin, those of you who are spiritually minded should [attempt to] restore such a person [to faithfulness]. But do it in a gentle way, being very careful that you yourself do not become tempted [to get involved in any sin].
1 Thessalonians 4:18
So, encourage one another with these words.
1 Thessalonians 5:11
Therefore, [continue to] encourage one another, and build each other up [spiritually], just as you are also doing.