It is narrated from Sayyiduna Qabisah bin Mukhariq (may Allah be pleased with him) that I fell into debt, and came to the Messenger of Allah (peace and blessings be upon him) in this regard. He (peace and blessings be upon him) said: "Qabisah! Stay until charity comes to us, and we will order it for you." Then he (peace and blessings be upon him) said: "O Qabisah! Asking is lawful only for three men: the man who is burdened with a debt and asks until the debt is paid, then he stops; the man who is struck by a sudden calamity and his wealth is ruined, and he asks until his affairs are set right, then he stops; and third, the man in severe need about whom three men of his people testify, and he asks until his living becomes easy, then he stops. Asking apart from this is unlawful; (whoever does so) consumes what is unlawful." He said this two or three times.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب قسم الصدقات / 13203