The Holy Prophet (S) said: "Ask (questions from) the learned, speak with the wise, and associate with the poor."
Tuhaf-ul-'Uqul, p. 34
Imam Amir-ul-Mu'mineen ‘Ali (‘a) said: "The cause of the cessation of (one's) wealth is leaving the needy heedless."
Ghurar-ul-Hikam, vol. 4, p. 190
Imam Amir-ul-Mu'mineen ‘Ali (‘a) said: "The Holy Prophet (S) narrated from Allah, the Exalted, on the night of ascent, Who said: 'O' Ahmad, My love is the loving of the poor. Bring the poor nearer to yourself and situate them close to yourself in order that I approach you..."
Al-Hayat, vol. 2, p. 51
Imam as-Sadiq (‘a) said: "Whoever satiates a hungry believer so that the one is satisfied fully, neither a human being among people nor a near-stationed angel nor a divine Messenger knows how great his reward is in the Hereafter except Allah, the Lord of the Worlds." Then, he added: "Feeding a hungry Muslim is from among the means of forgiveness." After that he recited the word of Allah, Almighty and Glorious: "Or the feeding on a day of hunger, of an orphan near of kin, or to the indigent (down) in the dust." (Sura Balad, No. 90, verses 14 to 16).
Al-Kafi, vol. 2, p. 201