Musannaf Ibn Abi Shayba 3:424

Abu Bakr narrated to us, he said: Ibn ‘Ulayyah narrated to us, from Yunus, from al-Hasan, he said: Umm al-Hasan narrated to me that she saw Umm Salamah, and her eye had become inflamed. So she placed for her a pillow made of tanned leather, and she began to prostrate upon it.