Even if he sins against you seven times in a day, and seven times returns to say, 'I repent,' you must forgive him."
Cross References
Matthew 18:21Then Peter came to Jesus and asked, "Lord, how many times shall I forgive my brother who sins against me? Up to seven times?"
Luke 17:5The apostles said to the Lord, "Increase our faith!"
 Treasury of Scripture
And if he trespass against you seven times in a day, and seven times in a day turn again to you, saying, I repent; you shall forgive him.
if.
Matthew 18:21,22,35
 Then came Peter to him, and said, Lord, how oft shall my brother sin against me, and I forgive him? till seven times? … 
1 Corinthians 13:4-7
 Charity suffereth long, and is kind; charity envieth not; charity vaunteth not itself, is not puffed up, … 
Ephesians 4:31,32
 Let all bitterness, and wrath, and anger, and clamour, and evil speaking, be put away from you, with all malice: … 
I repent.
Matthew 5:44
 But I say unto you, Love your enemies, bless them that curse you, do good to them that hate you, and pray for them which despitefully use you, and persecute you;
Matthew 6:12,14,15
 And forgive us our debts, as we forgive our debtors… 
Matthew 18:16
 But if he will not hear thee, then take with thee one or two more, that in the mouth of two or three witnesses every word may be established.