We were sitting with Messenger of Allah (ﷺ) when a man of Banu Salamah came to him and asked, "O Messenger of Allah! Is there any obedience to parents left that I can show to them after their death?" He (ﷺ) replied, "Yes, to pray for them, to supplicate for their forgiveness, to fulfill their promises after their death, to maintain the ties of kinship which cannot be maintained except through them, and honour their friends."

[Abu Dawud].