Hadith 18

We were with the Messenger of Allah (ﷺ) when a man asked, 'Messenger of Allah, is there any act of dutifulness which I can do for my parents after their death?' He replied, 'Yes. There are four things: Supplication for them, asking forgiveness for them, fulfilling their pledges, and being generous to friends of theirs. You only have ties of kinship through your parents.

Abu Usayd (رضي الله عنه)Al-Adab Al-Mufrad 35Adab with Parents