The first Passover required every family to take a bunch of hyssop, dip it in the blood of the slain lamb, and then apply it to the lintel and side posts of the door to their home (Exodus 12:21-22). The blood on the doorframe would certainly have been obvious to anyone passing by.
Jesus Christ is our Passover Lamb. He was the perfect Lamb of God sacrificed for us, and His blood has been applied to the souls of every believer. “For even Christ our passover is sacrificed for us…” (1 Corinthians 5:7).
Scripture gives us the picture that anyone who is a true follower of Jesus Christ (Matthew 16:24) will be as obvious to others as that door frame with the blood splashed on it was. Jesus gave us the mental image of a follower carrying his cross in this life. “Then said Jesus unto his disciples, If any man will come after me, let him deny himself, and take up his cross, and follow me” (Matthew 16:24). May we live for the One Who died for us.