Abu `Amr (also called Abu `Abdullah and also Abu Laila) from `Uthman bin `Affan (May Allah be pleased with him) reported:
After the burial of a dead man, the Prophet ﷺ would stand by the grave and say, "Ask Allah to forgive your brother and supplicate for him for steadfastness because he is being questioned (about his deeds) now."

[Abu Dawud].

عن أبي عمرو -وقيل: أبو عبد الله، وقيل: أبو ليلى- عثمان بن عفان رضي الله عنه قال: كان النبي ﷺى الله عليه وسلم الله عليه وسلم الله عليه وسلم إذا فرغ من دفن الميت وقف عليه، وقال: "استغفروا لأخيكم وسلوا له التثبيت، فإنه الآن يسأل" ((رواه أبو داود)).