What is the ruling on the grant received by a student after completing his master's degree, and is he obliged to return it to the state or donate it as charity?

A Muslim must fulfill conditions and be truthful in all their affairs, in accordance with the Almighty’s saying: (O YOU WHO HAVE BELIEVED, FULFILL [ALL] CONTRACTS) and (AND FULFILL [EVERY] COVENANT. INDEED, THE COVENANT WILL BE QUESTIONED), and the Prophet's (peace be upon him) saying: (Muslims are bound by their conditions, except a condition that makes lawful what is unlawful or makes unlawful what is lawful).

Therefore, you must inform the granting authority of your completion of studies within the standard time if that is a condition or a well-established custom with them. Your diligence in studying to finish early does not justify violating the scholarship system.

However, if the authority did not stipulate that and there was no established custom, then there is no harm in you continuing your stay and completing your higher education, provided that this is permissible within the scholarship system.

If a violation has occurred, the money must be returned to the granting authority, because it was taken without right. If that is difficult, it is permissible to spend it on public welfare, such as building a mosque or a hospital, as Al-Nawawi mentioned, quoting Al-Ghazali, that unlawful money should be spent on the general welfare of Muslims.

You are entitled to take only the apparent and agreed-upon rights, such as travel tickets or a computer device.