Musannaf Ibn Abi Shayba 33:975

'Affan narrated to us, he said: Hammad ibn Salamah narrated to us, he said: 'Ali ibn Zayd, Thabit, and Humayd informed us, from al-Hasan, that he said: The Bridge (al-Sirat) has thorns and prickly shrubs. The ones who slip—both men and women—will be many on that day.