Not graded
Bulugh al-Maram 330b
وَفِي رِوَايَةٍ لمُسْلِمٍ : { يُكَبِّرُ فِي كُلِّ سَجْدَةٍ وَهُوَ جَالِسٌ وَسَجَدَ اَلنَّاسُ مَعَهُ , مَكَانَ مَا نَسِىَ مِنَ الْجُلُوسِ } 1
1 - هذه الرواية عند مسلم (570) ( 86 ) ، كما أنها أيضا رواية البخاري ( 1230 ) .
In the narration of Muslim it is mentioned that, "He (ﷺ) uttered the Takbir for each prostration while sitting and the people prostrated with him to make up for the sitting he had forgotten."
Cited in Bulugh al-Maram (No. 330b).