Verses with the word propitiation in the New Testament (3 verses):

Romans 3:25
Whom God hath set forth to be a propitiation through faith in his blood, to declare his righteousness for the remission of sins that are past, through the forbearance of God;

1 John 2:2
And he is the propitiation for our sins: and not for our's only, but also for the sins of the whole world.

1 John 4:10
Herein is love, not that we loved God, but that he loved us, and sent his Son to be the propitiation for our sins.