"whosoever does not show compassion will not receive it"

It is reported by Al-Haakim in his Mustadrak that the Prophet (upon whom be peace and blessings) took the hand of the companion, AbdurRahmaan bin 'Owf, and they proceeded to visit the Prophet's ailing son, Ibraheem. They found the infant in the throes of death, so the Prophet took him to his breast and held him until his spirit left him. Then he put the child down and wept, whereupon Abdur-Rahmaan asked in astonishment, "You are weeping, Oh Messenger of Allah, while you prohibit crying!?" The following is the Prophet's reply: "Verily, I did not prohibit weeping but rather, I forbade two voices [sowtayn] which are imbecilic [ahmaq] and sinfully shameless [faajir]: one, a voice [singing] to the accompaniment of musical amusement [lahw] and Satan's [wind] instruments; the other, a voice [wailing] due to some calamity, accompanied by striking of the face and tearing of garments. But this [weeping of mine] stems from compassion, and whosoever does not show compassion will not receive it."
[taken from The Islamic Ruling on Music and Singing. Narration of Al-Haakim and others. This hadeeth's degree is hasan, and it has been strengthened by another narration related by Abu Bakr Ash-Shaafi'ee in his work, Ar-Rubaa'eeyat.]