I am a student, and I receive pocket money from my father. I want to use part of it to participate in building a mosque. Will the hasanah (reward for the good deed) be for me or for my father, because he is the one whose money it is?
Praise be to Allah.
If you give in charity some of the money that your father gave to you for your expenses and needs, then the hope is that by the grace and generosity of Allah, you will have the reward for this spending in full, and that your father, who earned this money and spent it on you, will also have a reward.
Al-Bukhaari (1440) and Muslim (1024) narrated that ‘Aa’ishah (may Allah be pleased with her) said: The Prophet (blessings and peace of Allah be upon him) said: “If a woman gives from the food that is in her husband’s house, without causing any damage, she will have the reward for that, and he will have a similar reward because he earned it, and her reward is because she gave it, and the storekeeper will have a similar reward, without anything being detracted from the reward of any of them.”
However, this applies only so long as that spending does not cause any damage to the wealth of the real owner, such as if the child or the wife spends too much that causes undermines that wealth, or gives more than he usually gives. In that case, it is essential to obtain the permission of the owner of the wealth.
See: Fath al-Baari (3/303).
For more information, please see the answer to question no. 103966.
And Allah knows best.