Mark 11:25 - 26
11:25 -
      And when ye stand praying, forgive, if ye have ought against any: that your Father also which
      is in heaven may forgive you your trespasses.
 
 11:26 - 
      But if ye do not forgive, neither will your Father which is in heaven forgive your trespasses. 
Ephesians 4:31 - 32
4:31 -
     Let all bitterness, and wrath, and anger, and clamour, and evil speaking, be put away from
     you, with all malice:
 
 4:32 - 
     And be ye kind one to another, tenderhearted, forgiving one another, even as God for Christ's
     sake hath forgiven you.