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Hisn al-Muslim (Fortress of the Muslim) 222
وَقَالَ صلى الله عليه وسلم:((إِنَّ لِلَّهِ مَلاَئِكَةً سَيَّاحِينَ فِي الْأَرْضِ يُبَلِّغُونِي مِنْ أُمَّتِي السَّلاَمَ)).
The Prophet [PBUH] said:'Indeed Allah has angels who roam the earth and they convey to me the greetings (or prayers of peace) of my 'Ummah (nation).
Cited in Hisn al-Muslim (Fortress of the Muslim) (No. 222).