Al-Baqarah · 2:273

273. You should spend on those poor people who, because they are busy striving in Allah’s path, are unable to travel to earn a living. Due to their not asking, a person that is unaware will think that they are not in need. However, the person who knows will recognise them by the signs that are apparent on their body and clothing. They are unlike other poor persons who beg persistently. Allah knows of any good or wealth you spend and He will give you a great reward for it.