Sunnah.com reference : Book 7, Hadith 114English translation : Book 7, Hadith 875Arabic reference : Book 7, Hadith 871
Narrated Qabisa bin Mukhariq al-Hilali (RA):
Allah's Messenger (ﷺ) said: "Begging is not lawful except to one of three (people): a man who has become a guarantor for a payment, for whom begging is lawful till he gets it, after which he must stop begging; a man whose wealth has been destroyed by a calamity which has befallen him, for whom begging is lawful till he gets what will support life; and a man who has been struck by poverty, the genuineness of which is confirmed by three intelligent members of his people, so it is lawful for him to beg."

[Reported by Muslim].
وَعَنْ قَبِيصَةَ بْنِ مُخَارِقٍ [ اَلْهِلَالِيِّ ] ‏- رضى الله عنه ‏- قَالَ: قَالَ رَسُولُ اَللَّهِ ‏- صلى الله عليه وسلم ‏-{ إِنَّ اَلْمَسْأَلَةَ لَا تَحِلُّ إِلَّا لِأَحَدِ ثَلَاثَةٍ: رَجُلٍ تَحَمَّلَ حَمَالَةً فَحَلَّتْ لَهُ اَلْمَسْأَلَةُ حَتَّى يُصِيبَهَا ثُمَّ يُمْسِكَ، وَرَجُلٍ أَصَابَتْهُ جَائِحَةٌ اِجْتَاحَتْ مَالَهُ, فَحَلَّتْ لَهُ اَلْمَسْأَلَةُ حَتَّى يُصِيبَ قِوَامًا مِنْ عَيْشٍ، وَرَجُلٍ أَصَابَتْهُ فَاقَةٌ حَتَّى يَقُولَ ثَلَاثَةٌ مِنْ ذَوِي الْحِجَى مِنْ قَوْمِهِ: لَقَدْ أَصَابَتْ فُلَانًا فَاقَةٌ, فَحَلَّتْ لَهُ اَلْمَسْأَلَةُ }  رَوَاهُ مُسْلِمٌ  1‏ .‏‏1 ‏- صحيح.‏ تقدم برقم 645.‏