Hadith: Tears are mercy from Allah

A dying child was once placed in the lap of the Prophet Muhammad (peace be upon him). Tears flowed from the Prophet's eyes. When he was questioned about crying for the child, the Prophet said: "(Tears are a form of) mercy that God has lodged in the hearts of His servants, and God is merciful only to those of His servants who are merciful (to others)."

Sahih Al-Bukhari, Volume 2, Hadith 373


The Prophet also said: "If, through fear of (displeasing) God, tears - even the size of a fly's
head - fall from any believer's eyes and drop on some part of his cheek, he will be kept away from Hell by God."

Al-Tirmidhi, Hadith 1433