Jethro said: "O, young man!
Jethro said: "O, young man! I swear to God that this was not what I had in mind when inviting you to dinner. I didn't intend to recompense your divine deed with food from my table. It is my father's and my custom to entertain guests and serve them food. After this discussion, Moses sat down at the table to eat.
[Bihar al-Anwar, v.13, p.21] Really, it is very astonishing that Moses had left Egypt some time ago and been wandering around in the wilderness, but during that time was not able to find any suitable food. He had eaten the sweet plants of the desert and upon entering Jethro's house he saw a prepared and pleasant table of food.
Even though he was terribly hungry, he would not partake of the food because he thought that this deed only for God's sake (watering the sheep) might possibly be lessened in the sight of Allah. However, when Jethro insured Moses that he also intended to please God and had sincere intentions in entertaining his guest, then Moses sat down to eat. Jethro's sincerity was the reason why Moses [16] became Jethro's shepherd for the next eight years.
And Moses' sincerity was the reason why the Prophet Jethro (Pbuh) became Moses's father-in-law. A Surprising Example of Sincerity For many years I had been a friend of one of the sincere men of the cloth in love with the (Pbuh) and his Household. His morality and behavior had taught me some good lessons. He told me that when he had left Tehran for Qum so as to become educated in theology, Ayatullah Al'Uzma Hajj Sheik Abdulkarim was the head of the Qum Seminary.
After some time, I was introduced to the Ayatullah as having an especial zeal for and way of reciting the tragedies of the Household of the Prophet Mohammed (Pbuh). I was requested to recite those tragedies for him at specified times. Gradually, I became renown for this type of recital and I was honored to be in the line of the professional reciters of the elegies for Imam Husayn (Pbuh).
One Thursday night I was taken to the home of one of the great clergymen who lived in the poorer parts of town and was asked to make a speech where I spoke for a few minutes about death referring to some lines from the book Nahj ul-Balaghah (The Peak of Eloquence). The house owner sobbed too much and even continued doing so until the end of the meeting. I was invited to go again next Thursday night and was instructed to speak about a lighter and more down to earth subject.