Majma al-Zawaid — Hadith 18306

Abu Muriyyah reports from the Prophet (peace and blessings be upon him); the narrator is in doubt, perhaps the words are: Sayyiduna Abdullah bin Amr (may Allah be pleased with him) reports that the Prophet (peace and blessings be upon him) said: "The two angels who will blow (the Trumpet) are in the second heaven. The head of one of them is in the east and his feet are in the west (the narrator is in doubt, perhaps the words are:) the head of one of them is in the west and his feet are in the east. Both of them are waiting for when they will be commanded to blow into the Trumpet, so that they blow into it."
Ahmad recorded it with the doubt. If it is from Abu Muriyyah, then it is mursal and its narrators are thiqat (trustworthy); and if it is from Sayyiduna Abdullah bin Amr (may Allah be pleased with him), then it is muttasil (connected) and musnad, and its narrators are thiqat (trustworthy).