A priest goes into a barbershop, gets a haircut, thanks the barber and asks how much he owes him.

The barber says, "Father, you're a holy man of the cloth, I couldn't charge you, it's on the house."

The priest says, "Thank you, my son," and leaves.

The next day, magically appearing on the doorstep of the barbershop are 12 silver coins. A few days later, a Sheik goes in for a trim, and when the time comes to pay the barber says,

"No money, please. You're a spiritual leader, a man of the people, it's on the house."

The Sheik says, "God bless you," and leaves.

The next day, magically appearing on the doorstep are 12 gold coins. The following week a rabbi comes in, gets a haircut, goes to pay, and the barber says,

"No, Rabbi, you are a learned man, a wise man, I can't take any money from you, go in peace."

The next day, magically appearing on the doorstep of the barbershop are 12 Rabbis!