“You are to take the second ram, and Aaron and his sons must lay their hands on the ram’s head. Slaughter the ram, take some of its blood, and put it on Aaron’s right earlobe, on his sons’ right earlobes, on the thumbs of their right hands, and on the big toes of their right feet."
EXODUS 29:19-20
Right Ears = hearing the Word of God
Right Thumbs = doing the work of God
Right Toes = walking in Right-eousness, in God's Will, in His promises
And no, left-handed people aren't evil.