Allah says "Give the kinsman his due, and the needy, and the wayfarer" [al-Isra' 26]. Allah also says: "[Show] kindness to parents, to near kin and orphans, to the needy, to relatives, to neighbors who are not related to you, to fellow travellers and wayfarers, and [to the slaves] whom your right hand possesses" [an-Nisa' 36].
Allah links feeding the needy with performing prayers. According to the following hadith, related by authentic sources, the Messenger of Allah, upon whom be peace, said: "He who does not have mercy upon people, Allah's mercy will be kept from him." Anyone upon whom Allah bestowed His grace and who sees his Muslim brother hungry, in need of clothes, and miserable, and still does not help him, he will, indeed, deprive himself of Allah's mercy.
Islam calls upon the individual to spend freely in ways that please the heart of the donor, and evoke generosity, goodness, reverence, and obedience to Allah:
Allah, the Exalted One, says: "The parable of those who spend their wealth in the way of Allah is that of a grain of corn: it grows seven ears, and each ear has a hundred grains. Allah gives manifold increase to whom He pleases; Allah cares for all and knows all things" [al-Baqarah 261].
"By no means shall you attain righteousness unless you give freely of that which you love, and whatever you give, Allah knows it well" [al'Imran 92].
"And spend from what We have made you heir. For those of you who believe and spend, for them is a great reward" [alHadid 7].
The Messenger of Allah, upon whom be peace, said: "The sadaqah of the Muslim increases during his lifetime. It also softens the agony of death, and through it, Allah takes away arrogance and vanity."
The Messenger of Allah, upon whom be peace, said: "Acts of kindness protect one from ruin wrought by evil. Sadaqah given secretly appeases the anger of the Lord, and a gift to strengthen the ties of relationship increases one's life span. All good deeds are sadaqah, and those who do acts of kindness in this world are also the same people in the other world. Those who do misdeeds in this world are the same people in the other world. The first of those who shall enter Paradise are the people who do acts of kindness." This is related by at-Tabarani in al'Awsat. Manzhiri does not mention it.