Musnad Ahmad 33:886

Abu Sa’id narrated to us, ‘Abd al-‘Aziz ibn ‘Abd Allah ibn Abi Salamah narrated to us, Muhammad ibn al-Munkadir narrated to us, Jabir ibn ‘Abd Allah narrated to us, he said: The Messenger of Allah (may Allah bless him and grant him peace) said—and he mentioned its meaning—he said: "Then I heard a *khashaf* (a rustling or thumping sound) in front of me," meaning a sound.