Philippians 1:6

being confident of this, that he who began a good work in you will carry it on to completion until the day of Christ Jesus.

Ephesians 4:31

Let all bitterness and wrath and anger and clamor [perpetual animosity, resentment, strife, fault-finding] and slander be put away from you, along with every kind of malice [all spitefulness, verbal abuse, malevolence].

Ephesians 4:27

27 Neither give place to the devil.