Ṣaḥīḥ Muslim

Jābir ibn ‘Abdullāh (may Allah be pleased with him) reported: We were with Messenger of Allah (may Allah's peace and blessings be upon him) shortly after dawn when there came to him some people clad in woolen rags, or covered with sleeveless blankets; and with swords hanging down from their necks. Most of them, rather all of them, belonged to the Mudar tribe. The Prophet's face changed when he saw them starving. Then he went into his house and came out; then he commanded Bilāl to proclaim the Adhān.

So he proclaimed the Adhān and recited Iqāmah and the Prophet led the prayer. Then he delivered a sermon saying: (O mankind, fear your Lord, who created you from one soul and created from it its mate and dispersed from both of them many men and women. And fear Allah, through whom you ask one another, and the wombs. Indeed Allah is ever, over you, an Observer) [Sūrat An-Nisā':1]. He also recited a verse at the end of Sūrat al-Hashr: (O you who believe, fear Allah and keep your duty to Him.

And let every one look what he has sent forth for the tomorrow.) Thereafter, every man gave in charity dinar, dirham, clothes, measure-fulls of wheat and measure-fulls of dates till he said: "(Give in charity) be it half a date." Then a man from the Ansār came with a bag which was difficult for him to hold in his hand. Thereafter, the people came successively (with charity) till I saw two heaps of food and clothes. I noticed that the Messenger's face was glowing like that of the bright moon or glittering gold.

Then he said: "Whosoever introduces a good practice in Islam, there is for him its reward and the reward of those who act upon it after him without anything being diminished from their rewards. And whosoever introduces an evil practice in Islam will shoulder its sin and the sins of all those who will act upon it, without diminishing in any way their burden."