“Who will loan to Allah, a beautiful loan,(QARZE-E-HASNA) which Allah will double and multiply many times? It is Allah who decreases or increases and to Him shall be your return ” -(Quran, Sura Baqara 2:245)
The Messenger of Allah صلي الله عليه وسلم said, “ When a person dies, his deeds come to an end, except for three: ongoing charity (Sadaqa Jāriya), knowledge that is benefited from, and a righteous child who prays for him .” (Muslim, Tirmidhi).