Musnad Abu Ya'la al-Mawsili 252:16

Muhammad ibn Yahya al-Zamani narrated to us, Makki ibn Ibrahim narrated to us, Musa ibn Ubaydah narrated to us, from Umar ibn al-Hakam, from Abdullah ibn Amr, and from Abu Hazim, from Sahl ibn Sa’d, that he said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "Below Allah are seventy thousand veils of light and darkness. No soul hears anything of the sound of those veils except that its soul departs."