,
"It is sunnah to recite the Qur'an for the dead. When it reaches khatam, then it is better."
Imam Nawawi in the book Majmu 'also said that it is sunnah for people who visit the grave to read verses of the Qur'an and pray for those who have died. Imam Al-Qurtubi also shows the evidence for the arrival of our prayers on people who have died. Like the Prophet Muhammad. once split a date frond and placed it on the graves of two of his friends and said: "Hopefully this frond can lighten both of them as long as the frond is not dry." From there, Imam Al-Qurtubi expressed the opinion that date palm leaves can lighten the burden of grave experts. While the verses of the Qur'an and prayers that are said will be more beneficial for people who have died.[6]
