What is the text of the hadith on instructing the deceased, "When the two angels come to you and ask you, 'Who is your Lord?' then say, 'My Lord is Allah...'," and where is it mentioned in the books of Sunnah, and what is the reason for its weakness?

The Hadith about instructing the deceased after burial was reported by Al-Tabarani in Al-Mu'jam Al-Kabeer with a weak chain of transmission. It was deemed weak by a group of scholars, but Al-Diya' and Al-Hafiz Ibn Hajar strengthened it due to its supporting narrations.