Fabricated Hadeeth
Question

                I heard from one of the Shaykhs (scholars/speakers) that the Messenger of Allah (peace and blessings of Allah be upon him) was sitting among his Companions (may Allah be pleased with them) when a man walked in front of them carrying a bag of grain. When the Prophet (peace and blessings of Allah be upon him) saw him he smiled. After a while the man came back, and the Messenger of Allah (peace and blessings of Allah be upon him) said tasbeeh (glorified Allah) fervently. The Sahabah/Companions (may Allah be pleased with them) asked him about this man and he (peace and blessings of Allah be upon him) said: This man was going to his field to sow the grain and wait for months until it grew, then wait for a while before it produced grains and he could harvest it. The reason why I smiled is that he had only seven days left in this world. Then he passed by on his way to see his sister who is the mother of orphans and he found them in a bad way so he gave them the bag of grain that he had, and said to himself: Allah will provide for me. And Allah added seventy years to his lifespan.

My question is:  

Is this story true? If it is true, where can I find its source?
Praise be to Allah.
    This story has no 
    basis, and we could not find it after a lengthy search. 

    And Allah knows 
    best.