(Al-Hijr) 15 : 57
قَالَ فَمَا خَطْبُكُمْ أَيُّهَا الْمُرْسَلُونَ
He asked: “Oh Messengers! Then what is your main mission?"
Angels will not come to earth except for a mission. See explanation 6: 158 and 11: 74.