Hisn al-Muslim
-- The Prophet (ﷺ) said: "Indeed Allah has angels who roam the earth and they convey to me the greetings (or prayers of peace) of my Ummah (nation)." Reference: An-Nasa'i, Al-Hakim 2/421. Al-Albani graded it authentic in Sahih An-Nasa'i 1/274.
وَقَالَ صلى الله عليه وسلم:(إِنَّ لِلَّهِ مَلاَئِكَةً سَيَّاحِينَ فِي الْأَرْضِ يُبَلِّغُونِي مِنْ أُمَّتِي السَّلاَمَ)
Reference