من هو أول ملك سجد لآدم عليه السلام؟

There is no authentic hadith or narration that specifies which angel was the first to prostrate to Adam (peace be upon him). The Holy Quran mentions that all the angels prostrated. Al-Hafiz Ibn Hajar mentioned, quoting Al-Naqqash, that Israfil was the first of the angels to prostrate, but he did not mention that this prostration was to Adam.