Messenger of Allah (Sallallähu alaihi wa sallam) said, "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.
- A person who has been smitten by poverty.
...besides these three (every other reason) for begging is forbidden, and one who engages in such consumes that what is forbidden."
Book: Sahih Muslim 2271