Abdullah bin Abdur Rahman Ansari reported that Sayyiduna Abu Sa'id Khudri (may Allah be pleased with him) said to him: "You take care of goats and the wilderness, so when you are in the wilderness among your goats, call the adhan for prayer in a loud voice, for the voice of the mu'adhdhin does not reach any jinn, nor human, nor anything else, except that it will bear witness for him on the Day of Resurrection." Sayyiduna Abu Sa'id (may Allah be pleased with him) said: "I heard this from the Messenger of Allah (peace and blessings be upon him)."