I was under debt and I came to the Messenger of Allah ﷺ and begged from him regarding it. He said: Wait till we receive Sadaqa, so that we order that to be given to you. He again said: Qabisa, begging is not permissible but for one of the three (classes) of persons: one who has incurred debt, for him begging is permissible till he pays that off, after which he must stop it; a man whose property has been destroyed by a calamity which has smitten him, for him begging is permissible till he gets what will support life, or will provide him reasonable subsistence; and a person who has been smitten by poverty. the genuineness of which is confirmed by three intelligent members of this peoples for him begging is permissible till he gets what will support him, or will provide him subsistence. Qabisa, besides these three (every other reason) for begging is forbidden, and one who engages in such consumes that what is forbidden.  

تَحَمَّلْتُ حَمَالَةً فَأَتَيْتُ رَسُولَ اللَّهِ ﷺ أَسْأَلُهُ فِيهَا فَقَالَ أَقِمْ حَتَّى تَأْتِيَنَا الصَّدَقَةُ فَنَأْمُرَ لَكَ بِهَا قَالَ ثُمَّ قَالَ يَا قَبِيصَةُ إِنَّ الْمَسْأَلَةَ لاَ تَحِلُّ إِلاَّ لأَحَدِ ثَلاَثَةٍ رَجُلٍ تَحَمَّلَ حَمَالَةً فَحَلَّتْ لَهُ الْمَسْأَلَةُ حَتَّى يُصِيبَهَا ثُمَّ يُمْسِكُ وَرَجُلٍ أَصَابَتْهُ جَائِحَةٌ اجْتَاحَتْ مَالَهُ فَحَلَّتْ لَهُ الْمَسْأَلَةُ حَتَّى يُصِيبَ قِوَامًا مِنْ عَيْشٍ أَوْ قَالَ سِدَادًا مِنْ عَيْشٍ وَرَجُلٍ أَصَابَتْهُ فَاقَةٌ حَتَّى يَقُومَ ثَلاَثَةٌ مِنْ ذَوِي الْحِجَا مِنْ قَوْمِهِ لَقَدْ أَصَابَتْ فُلاَنًا فَاقَةٌ فَحَلَّتْ لَهُ الْمَسْأَلَةُ حَتَّى يُصِيبَ قِوَامًا مِنْ عَيْشٍ أَوْ قَالَ سِدَادًا مِنْ عَيْشٍ فَمَا سِوَاهُنَّ مِنَ الْمَسْأَلَةِ يَا قَبِيصَةُ سُحْتًا يَأْكُلُهَا صَاحِبُهَا سُحْتًا