I fell ill in Persia and therefore, prayed in a sitting posture, and I asked 'A'isha about it and she said: The Messenger of Allah ﷺ prayed for a long time in the night sitting.  

كُنْتُ شَاكِيًا بِفَارِسَ فَكُنْتُ أُصَلِّي قَاعِدًا فَسَأَلْتُ عَنْ ذَلِكَ عَائِشَةَ فَقَالَتْ كَانَ رَسُولُ اللَّهِ ﷺ يُصَلِّي لَيْلاً طَوِيلاً قَائِمًا فَذَكَرَ الْحَدِيثَ  

I asked 'A'isha about the prayer of the Messenger of Allah ﷺ during the night (i. e. Tahajjud prayer) She replied: He used to pray for a long time standing and for a long time sitting in the night, and when he recited the Qur'an while standing, he would bow himself from the standing position, and when he recited while sitting, he would bow from the sitting position.  

عَنْ صَلاَةِ رَسُولِ اللَّهِ ﷺ بِاللَّيْلِ فَقَالَتْ كَانَ يُصَلِّي لَيْلاً طَوِيلاً قَائِمًا وَلَيْلاً طَوِيلاً قَاعِدًا وَكَانَ إِذَا قَرَأَ قَائِمًا رَكَعَ قَائِمًا وَإِذَا قَرَأَ قَاعِدًا رَكَعَ قَاعِدًا  

The Messenger of Allah ﷺ used to pray standing at night for a long time, and used to pray sitting at night for a long time. When he prayed standing, he bowed standing, and when he prayed sitting, he bowed sitting.  

كَانَ رَسُولُ اللَّهِ ﷺ يُصَلِّي لَيْلاً طَوِيلاً قَائِمًا وَلَيْلاً طَوِيلاً قَاعِدًا فَإِذَا صَلَّى قَائِمًا رَكَعَ قَائِمًا وَإِذَا صَلَّى قَاعِدًا رَكَعَ قَاعِدًا  

“I asked ‘Aishah about the prayer of the Messenger of Allah ﷺ at night. She said: ‘He used to pray for a long time at night standing up, and for a long time at night sitting down. If he prayed standing, he would bow standing, and if he prayed sitting, he would bow sitting.’”  

عَنْ صَلاَةِ رَسُولِ اللَّهِ ﷺ بِاللَّيْلِ فَقَالَتْ كَانَ يُصَلِّي لَيْلاً طَوِيلاً قَائِمًا وَلَيْلاً طَوِيلاً قَاعِدًا فَإِذَا قَرَأَ قَائِمًا رَكَعَ قَائِمًا وَإِذَا قَرَأَ قَاعِدًا رَكَعَ قَاعِدًا  

“I asked ‘Aishah about the prayer of the Messenger of Allah ﷺ at night. She said: ‘He used to pray for a long time at night standing up, and for a long time at night sitting down. If he prayed standing, he would bow standing, and if he prayed sitting, he would bow sitting.’” (Using translation from Ibn Mājah 1228)   

قُلْتُ لِعَائِشَةَ أَكَانَ رَسُولُ اللهِ ﷺ يُصَلِّي قَاعِدًا؟ قَالَتْ كَانَ يُصَلِّي مِنَ اللَّيْلِ طَوِيلًا قَاعِدًا وَيُصَلِّي مِنَ اللَّيْلِ طَوِيلًا قَائِمًا فَإِذَا قَرَأَ قَائِمًا رَكَعَ قَائِمًا وَإِذَا قَرَأَ قَاعِدًا رَكَعَ قَاعِدًا  

“I asked ‘Aishah about the prayer of the Messenger of Allah ﷺ at night. She said: ‘He used to pray for a long time at night standing up, and for a long time at night sitting down. If he prayed standing, he would bow standing, and if he prayed sitting, he would bow sitting.’” (Using translation from Ibn Mājah 1228)   

عَنْ صَلَاةِ رَسُولِ اللهِ ﷺ بِاللَّيْلِ؟ فَقَالَتْ كَانَ يُصَلِّي لَيْلًا طَوِيلًا قَائِمًا وَلَيْلًا طَوِيلًا قَاعِدًا وَكَانَ إِذَا قَرَأَ قَائِمًا رَكَعَ قَائِمًا وَإِذَا قَرَأَ جَالِسًا رَكَعَ جَالِسًا  

[Machine] The Prophet ﷺ used to pray long nights, both standing and sitting. I asked: "So how did he perform his prayers?" She said: "When he recited while standing, he would perform a raka'a while standing, and when he recited while sitting, he would perform a raka'a while sitting."  

كَانَ رَسُولُ اللهِ ﷺ يُصَلِّي لَيْلًا طَوِيلًا قَائِمًا وَلَيْلًا طَوِيلًا جَالِسًا قُلْتُ فَكَيْفَ كَانَ يَصْنَعُ؟ قَالَتْ كَانَ إِذَا قَرَأَ قَائِمًا رَكَعَ قَائِمًا وَإِذَا قَرَأَ جَالِسًا رَكَعَ جَالِسًا  

“I asked ‘Aishah about the prayer of the Messenger of Allah ﷺ at night. She said: ‘He used to pray for a long time at night standing up, and for a long time at night sitting down. If he prayed standing, he would bow standing, and if he prayed sitting, he would bow sitting.’” (Using translation from Ibn Mājah 1228)  

عَنْ صَلَاةِ رَسُولِ اللهِ ﷺ مِنَ اللَّيْلِفَقَالَتْ كَانَ يُصَلِّي لَيْلًا طَوِيلًا قَائِمًا وَلَيْلًا طَوِيلًا قَاعِدًا فَإِذَا قَرَأَ قَائِمًا رَكَعَ قَائِمًا وَإِذَا قَرَأَ قَاعِدًا رَكَعَ قَاعِدًا  

[Machine] The Prophet ﷺ used to pray long standing prayers at night and long sitting prayers at night. I asked, "How did he used to do that?" She said, "When he recited while standing, he performed two units of prayer while standing, and when he recited while sitting, he performed two units of prayer while sitting."  

كَانَ النَّبِيُّ ﷺ يُصَلِّي لَيْلًا طَوِيلًا قَائِمًا وَلَيْلًا طَوِيلًا قَاعِدًا قَالَ قُلْتُ كَيْفَ كَانَ يَصْنَعُ؟ قَالَتْ كَانَ إِذَا قَرَأَ قَائِمًا رَكَعَ قَائِمًا وَإِذَا قَرَأَ قَاعِدًا رَكَعَ قَاعِدًا  

The Messenger of Allah ﷺ used to pray standing at night for a long time, and used to pray sitting at night for a long time. When he prayed standing, he bowed standing, and when he prayed sitting, he bowed sitting. (Using translation from Abū Dāʾūd 955)  

«كَانَ رَسُولُ اللَّهِ ﷺ يُصَلِّي لَيْلًا طَوِيلًا قَائِمًا وَلَيْلًا طَوِيلًا قَاعِدًا فَإِذَا صَلَّى قَائِمًا رَكَعَ قَائِمًا وَإِذَا صَلَّى قَاعِدًا رَكَعَ قَاعِدًا»  

The Messenger of Allah ﷺ used to pray standing at night for a long time, and used to pray sitting at night for a long time. When he prayed standing, he bowed standing, and when he prayed sitting, he bowed sitting. (Using translation from Abū Dāʾūd 955)   

عَنْ صَلَاةِ رَسُولِ اللَّهِ ﷺ فَقَالَتْ «كَانَ رَسُولُ اللَّهِ ﷺ يُصَلِّي لَيْلًا طَوِيلًا قَاعِدًا وَلَيْلًا طَوِيلًا قَائِمًا فَإِذَا صَلَّى قَاعِدًا رَكَعَ قَاعِدًا وَإِذَا صَلَّى قَائِمًا رَكَعَ قَائِمًا»  

The Messenger of Allah ﷺ used to pray standing at night for a long time, and used to pray sitting at night for a long time. When he prayed standing, he bowed standing, and when he prayed sitting, he bowed sitting. (Using translation from Abū Dāʾūd 955)  

أَنَّهَا قَالَتْ «كَانَ رَسُولُ اللَّهِ ﷺ يُصَلِّي لَيْلًا طَوِيلًا قَائِمًا وَلَيْلًا طَوِيلًا قَاعِدًا فَإِذَا صَلَّى قَائِمًا رَكَعَ قَائِمًا وَإِذَا صَلَّى قَاعِدًا رَكَعَ قَاعِدًا»  

"عَنْ عَبْدِ اللهِ بْنِ شَقِيقٍ قَالَ: سَأَلْتُ عَائِشَةَ عَنْ صَلَاةِ النَّبِيِّ ﷺ قَالَتْ: كَانَ النَّبِيُّ ﷺ يُصَلِّي لَيْلًا طَوِيلًا قَائِمًا، وَلَيْلًا طَوِيلًا قَاعِدًا، قُلْتُ: كَيْفَ كَانَ يَصْنَعُ؟ قَالَتْ: إِذَا كَانَ قَرَأَ قَائِمًا رَكَعَ قَائِمًا، وَإِذَا قَرَأَ قَاعِدًا رَكَعَ قَاعِدًا".