The Sufficient (Vol 3) · Hadith 1251 (#Ḥadīth #8)
Chapter 27 | Objects on Which Sajdah Is Permissible and What Is Undesirable
8ـ مُحَمَّدُ بْنُ يَحْيَى بِإِسْنَادِهِ قَالَ قَالَ أَبُو عَبْدِ الله (عَلَيْهِ الْسَّلام) السُّجُودُ عَلَى الأرْضِ فَرِيضَةٌ وَعَلَى الْخُمْرَةِ سُنَّةٌ.
8. Muhammad ibn Yahya has narrated through the chain of narrators has said the following: “Abu ’Abd Allah , has said, ’Performing Sujud (prostration) on earth is obligatory and on a prayer mat is a tradition.”
Gradings are classical jarḥ-wa-taʿdīl, name-matched to a rijāl index (not individually re-verified).