1. At the time of lowering the deceased in the grave, one should recite the following dua:
بِسمِ اللهِ وَعَلىَ سُنَّةِ رَسُولِ اللهِ
In the name of Allah Ta‘ala, and upon the way of Rasulullah (sallallahu ‘alaihi wasallam) (I am lowering the deceased in the grave)
عن ابن عمر: أن النبي صلى الله عليه وسلم كان إذا وضع الميت في القبر قال: بسم الله وعلى سنة رسول الله (سنن أبي داود، الرقم: 3213)
Hazrat ibnu Umar (radhiyallahu ‘anhuma) reports that whenever Rasulullah (sallallahu ‘alaihi wasallam) would lower the deceased into the grave, he would recite the following dua:
بِسمِ اللهِ وَعَلىَ سُنَّةِ رَسُولِ اللهِ