Musnad Abu Ya'la al-Mawsili 243:50

Abu Bakr ibn Abi Shaybah narrated to us, Ubayd Allah ibn Musa narrated to us, Ibrahim ibn Isma'il narrated to us, from Salih ibn Kaysan, from Yazid al-Raqashi, from his father, from Abu Musa, who said: The Messenger of Allah (may Allah bless him and grant him peace) said: "Seventy prophets passed by the rock of al-Rawha', barefoot, wearing cloaks."