But if we confess our sins to him, he is faithful and just to forgive us our sins and to cleanse us from all wickedness.
~ 1 John 1:9 [NLT]
Ask God to check your heart and life and show you areas where you might need to ask for forgiveness from Him. Then, it is your turn to forgive those who have offended you. We can even choose to forgive them in advance! Ask God to forgive you and to help you forgive others.