Imam Musa Al-Kadhim (as) and Prison Guards:

In the time of our 7th Imam, Imam Musa Al-Kadhim (as) the ruler was
Abbasid Caliph called Haroon Rasheed, who hated Imam Musa Al-Kadhim
(as).
Haroon Rasheed came to Madina where Imam Musa Al-Kadhim (as) lived and
had Imam Musa Al-Kadhim (as) arrested and sent to a prison in Basra,
Iraq.
Imam Musa Al-Kadhim (as) stayed in this prison under the guard of a
man called Yahyah.
Imam Musa Al-Kadhim (as) was a kind man who always talked nicely to
everyone, even Yahyah who kept him in prison. Soon Yahyah felt bad for
keeping such a nice person in prison.
Haroon Rasheed found out and took Imam Musa Al-Kadhim (as) to another
prison. Again Imam Musa Al-Kadhim (as) through his kindness and
politeness made the other person also feel bad.
The cruel Abbasid Caliph, Haroon Rasheed, poisoned the food of Imam
Musa Al-Kadhim (as) in the prison of Baghdad. The dose proved fatal
and the 7th Imam, Imam Musa Al-Kadhim (as) kissed martyrdom.
Moral:No matter how horrible someone is to you, you should always be
nice to them and soon they will feel bad about how horrible they are
being to you.