"Testifying...repentance toward God, and faith toward our Lord Jesus Christ"

Acts 20:23

Repentance and faith go together to compliment each other. You could compare it to a door and it's frame. Repentance is the door which shuts out sin and faith is the frame on which it's hinges are fixed. A door without a frame is of no use at all. What God has joined together let no man take apart. These two are inseparable---repentance and faith.