Musnad Abu Ya'la al-Mawsili 42:9

Abu Khaythama narrated to us, Sufyan narrated to us, from Ibn Abi Sa'sa'ah, from his father, and his mother was with Abu Sa'id. He said: He (meaning Abu Sa'id) said: "O my son, when you are in the wilderness, raise your voice with the Adhan, for I heard the Messenger of Allah, peace and blessings of Allah be upon him, say: 'No jinn, nor human, nor stone, nor tree hears the sound of his voice except that it will testify for him.'"