Muslim's death and 40 days after
Fatwa No: 83604

Question

When a Muslim dies what is the family supposed to do after burial concerning the forty days?

Answer

Praise be to Allah, the Lord of the World; and blessings and peace be upon our Prophet Muhammad and upon all his Family and Companions.

There is no sound evidence from Sharia that the family of the deceased should do anything on the fortieth day after his death.
What is certain in Sharia is that the family of the deceased should supplicate for him asking Allah to forgive him and giving alms on his behalf intending that Allah gives him the reward of all these acts.
As for the ceremony some people do forty days after the death of one of theirs, it is pure innovation. Such practice was not done by the Prophet, his companions, their rightly guided successors or any other good Muslims in the past. So one should avoid it completely.
Allah knows best.

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