Is the money that a father sends to his son for his studies, which the father acquired from usurious banking transactions and bribes, lawful or unlawful? And must the son dispose of his possessions if the money is unlawful? And is it permissible for the son to use this money for acts of obedience if it is lawful?

Whatever comes from the father's money, if it is lawful, then it is permissible to take it and benefit from it. But if it is unlawful, such as usurious interest, then it is not permissible to benefit from it. If the source is unknown, then if the lawful predominates, it is permissible to take from it when needed. But if the unlawful predominates, then nothing should be taken from it. As for the past benefit from this unlawful money, we hope that Allah will forgive it through sincere repentance. As for the lawful money from his salary or trade, there is no harm in benefiting from it in any way.