Treat Your Friends with Kindness
In the days of the Holy Prophet (SAW) lived a person called Thabit bin Qays. This man was weak of hearing and therefore, he always sat near the Holy Prophet (SAW) to listen to his sermons.
One day, he was late at Mosque and the Holy Prophet (SAW) was in the 2nd unit of his morning prayer. So he joined the congregation in the last row and completed his prayer. Thereafter, he started to break the lines of the people in order to reach near the Prophet (SAW). In his effort, he pushed some people aside but nobody said anything to him. In his place sat a gentleman, who, if he moved slightly, Thabit could get his usual place but the man did not oblige and told Thabit, "Sit where you are." Throughout the sermon, Thabit kept on looking at him with agitation and as soon as the sermon was over, he asked the man, "Who are you?" The man replied, "I am the son of so and so."
Apparently, in the days of ignorance, the mother of this man had a bad name. When Thabit heard who he was, he ridiculed him in front of everyone and said, "You are the son of such and such woman, who was notorious for her bad deeds." The man felt sad and ashamed of himself and thus lowered his face. Thabit had not done a wise thing! As a result of his action, the following verse was revealed, "O you who have faith! Let not any people ridicule another people: it may be that they are better then they are" (49:11) (Tafseer of Surah al-Hujuraat by Ayatullah Dasti Ghayb).
Imam Muhammad al-Baqir (AS) has said, "Treat your companions and friends with kindness and never make face or show contempt towards them" (Al-Kaafi).