Abu Dawud

1692. Commentary: That is, one’s wife and children whose expenses are his responsibility, or those individuals who are under his care. For example, parents or other relatives, or servants and attendants, and employees of an institution under his management to whom he pays a salary. To not give such dependents their financial rights, or to give them less, or to delay giving them without reason, or to neglect them while giving charity to others and not caring for them, is tantamount to neglecting them. And it is a sin. The same warning applies to depriving animals and birds under one’s ownership of their rights. Along with this meaning and understanding, it can also mean that a person neglects the one through whom he receives sustenance and provision... That is, if that person is deserving of service, then not serving him. For example, the husband for the wife, and the father for the children... or not being grateful to him. For example, a brother for a brother, or unnecessarily finding faults in him, or not forgiving if he makes a mistake, etc.—due to these reasons, a person’s means of sustenance may be cut off, or the bonds of affection, love, and kinship may be severed. And if he loses them, then this is a sinful matter. The statements of the Messenger of Allah (sallallahu alayhi wa sallam), may my parents be sacrificed for him, of this kind are proof that he was the possessor of comprehensive speech (jawami‘ al-kalim). (Allahumma salli wa barik wa sallim ‘alayh)

Benefit:
In this hadith, the responsibility of providing food and maintenance is mentioned—that whoever does not spend on his family and dependents is a wrongdoer. And it is a well-known fact that the most virtuous form of charity (sadaqah) is to spend on one's own family and dependents.