Who is playing knock-knock on the door of my heart? (Say)
Who is playing knock-knock on the door of my heart? (Hey)
Who is playing knock-knock on the door of my heart? (Say)
Satan's playing knock-knock but he must go away

For it is Jesus who has now come to stay
Old Satan must depart, he can't stay in my heart
Yes it is Jesus who has now come to stay
Old Satan must depart, he can't stay in my heart

Who is playing knock-knock on the door of my heart? (Say)
Who is playing knock-knock on the door of my heart? (Hey)
Who is playing knock-knock on the door of my heart? (Say)
Satan's playing knock-knock but he must go away

For it is Jesus who has now come to stay
Old satan must depart, he can't stay in my heart
Yes it is Jesus who has now come to stay
Old Satan must depart, he can't stay in my heart
So scram, now, go away