The Prophet ﷺ was in the first two rak'ahs as though he were on heated stones. The narrator Shu'bah said: We said: Till he (the Prophet) got up. (Using translation from Abū Dāʾūd 995)   

أَنَّ النَّبِيَّ ﷺ كَانَ فِي الرَّكْعَتَيْنِ كَأَنَّهُ عَلَى الرَّضْفِ قَالَ سَعْدٌ قُلْتُ لِأَبِي حَتَّى يَقُومَ قَالَ حَتَّى يَقُومَ  

The Prophet ﷺ was in the first two rak'ahs as though he were on heated stones. The narrator Shu'bah said: We said: Till he (the Prophet) got up. (Using translation from Abū Dāʾūd 995)   

كَانَ رَسُولُ اللهِ ﷺ فِي الرَّكْعَتَيْنِ الْأُولَيَيْنِ كَأَنَّهُ عَلَى الرَّضْفِ قَالَ قُلْتُ لِأَبِي حَتَّى يَقُومَ قَالَ حَتَّى يَقُومَ  

[Machine] The translation is: "It was reported that when the Messenger of Allah ﷺ sat down in the first two units (rak'ahs) of prayer, it was as if he was sitting on a cushion. I (Saad) said, 'Until when should I wait before standing (from the sitting position)?' He replied, 'Until he stands up.' Hajjaj said, 'Shu'bah reported that Saad used to move his lips with something during prayer, so I asked, 'Until when should I wait before standing?' He replied, 'Until he stands up.'"  

أَنَّ رَسُولَ اللهِ ﷺ كَانَ إِذَا قَعَدَ فِي الرَّكْعَتَيْنِ الْأُولَيَيْنِ كَأَنَّهُ عَلَى الرَّضْفِ قُلْتُ لِسَعْدٍ حَتَّى يَقُومَ؟قَالَ حَتَّى يَقُومَ قَالَ حَجَّاحٌ قَالَ شُعْبَةُ كَانَ سَعْدٌ يُحَرِّكُ شَفَتَهُ بِشَيْءٍ فَقُلْتُ حَتَّى يَقُومَ؟ قَالَ حَتَّى يَقُومَ  

[Machine] That the Prophet ﷺ used to be as if he was on a cushion when he was in the two bowings (of prayer), so I would say (a supplication) until he stood up, and he would say (a supplication) until he stood up.  

أَنَّ النَّبِيَّ ﷺ كَانَ إِذَا كَانَ فِي الرَّكْعَتَيْنِ كَأَنَّهُ عَلَى الرَّضْفِ فَأَقُولُ حَتَّى يَقُومَ فَيَقُولُ حَتَّى يَقُومَ