The Sufficient (Vol 3) · Hadith 1269 (#Ḥadīth #3)
Chapter 29 | Manners of Standing and Sitting Positions in Salah (prayer)
3ـ جَمَاعَةٌ عَنْ أَحْمَدَ بْنِ مُحَمَّدِ بْنِ عِيسَى عَنِ الْحُسَيْنِ بْنِ سَعِيدٍ عَنْ فَضَالَةَ بْنِ أَيُّوبَ عَنِ الْحُسَيْنِ بْنِ عُثْمَانَ عَنْ سَمَاعَةَ عَنْ أَبِي بَصِيرٍ عَنْ أَبِي عَبْدِ الله (عَلَيْهِ الْسَّلام) قَالَ لاَ تُقْعِ بَيْنَ السَّجْدَتَيْنِ إِقْعَاءً.
3. A group has narrated from Ahmad ibn Muhammad ibn ‘Isa from al-Husayn ibn Sa‘id from Fadalah ibn Ayyub from al-Husayn ibn ‘Uthman from Sama‘ah from abu Basir who has said the following: “Abu ‘Abd Allah , has said, ‘You must not sit, between the two sajdah, placing your hips on your heels.’”
Gradings are classical jarḥ-wa-taʿdīl, name-matched to a rijāl index (not individually re-verified).