The Holy Prophet [s] said: "When charity (alms) is delivered out of the hand of its owner, it (the thing being given) says five things: 'At first I was perishing and you gave me life; I was insignificant and you made me great; I was an enemy and you turned me into a friend; you used to protect me then but now I will protect you up to the Day of Resurrection'."
Al-Ithna 'Ashariyyah, p.223
Imam Kazim, the seventh Imam, [a], said: "He who makes a Muslim believer happy, then, he has initially pleased Allah, secondly the Prophet and thirdly us (Ahlul-Bayt)."
Bihar-ul-Anwar, vol. 74, p. 314
Imam Amir-ul-Mu'mineen [a] said: Allah, the Glorified, has fixed the livelihood of the destitute in the wealth of the rich. Consequently, whenever a destitute remains hungry it is because some rich persons have denied him (his share)."
Nahjul Balagha, p. 533, saying No. 328
Imam Sadiq [a] said: "By Allah, he who withholds his wealth from helping a needy believer will never taste the food of Heaven nor drink from the drink sealed there."
Bihar-ul-Anwar, vol. 75, p. 314