Two Christian missionaries, David & Michael were lost in scorching desert, dying of thirst and hunger when at last they saw a mosque upfront.

David said: "Michael, let's pretend we are muslims. Otherwise, we will not get any food or water and we will die. My name will be Kabiru. What will be your name?"

Michael refused to change his name.
When both of them reached the mosque, the Imam received them well and asked their names.

David: My name is Kabiru.

Michael: My name is Michael.

The Imam turned to his helpers and said: "Please, bring food and water for Michael"

Then he turned to David and said: "Kabiru, Ramadan Mubarak"......David fainted.

What is the moral of this story?