"The Messenger of Allah ﷺ used to pray eleven rak'ahs, making it odd (witr) by one between the time when he finished 'Isha and dawn, and he would prostrate for as long as it takes one of you to recite fifty verses before raising his head."  

عَائِشَةُ كَانَ رَسُولُ اللَّهِ ﷺ يُصَلِّي فِيمَا بَيْنَ أَنْ يَفْرُغَ مِنْ صَلاَةِ الْعِشَاءِ إِلَى الْفَجْرِ إِحْدَى عَشْرَةَ رَكْعَةً وَيُوتِرُ بِوَاحِدَةٍ وَيَسْجُدُ سَجْدَةً قَدْرَ مَا يَقْرَأُ أَحَدُكُمْ خَمْسِينَ آيَةً قَبْلَ أَنْ يَرْفَعَ رَأْسَهُ وَبَعْضُهُمْ يَزِيدُ عَلَى بَعْضٍ فِي الْحَدِيثِ مُخْتَصَرٌ  

"The Messenger of Allah ﷺ used to pray eleven rak'ahs at night between finishing Isha' prayer and Fajr, apart from the two rak'ahs of Fajr, and he would prostrate for as long as it takes one of you to recite fifty verses.  

كَانَ رَسُولُ اللَّهِ ﷺ يُصَلِّي إِحْدَى عَشْرَةَ رَكْعَةً فِيمَا بَيْنَ أَنْ يَفْرُغَ مِنْ صَلاَةِ الْعِشَاءِ إِلَى الْفَجْرِ بِاللَّيْلِ سِوَى رَكْعَتَىِ الْفَجْرِ وَيَسْجُدُ قَدْرَ مَا يَقْرَأُ أَحَدُكُمْ خَمْسِينَ آيَةً  

"Between the time when he finished 'Isha' prayer and Fajr, the Prophet ﷺ used to pray eleven Rak'ahs, saying the Taslim after each two Rak'ahs, then praying Witr as one Rak'ah. He would prostrate for as long as it takes one of you to recite fifty verses, then he would raise his head. When the Mu'adhdhin finished the call to Fajr prayer and he could see the dawn, he would pray two brief Rak'ahs, then he would go out with him." Some of these narrators (Ibn Abi Dhi'b, Yunus and 'Amr bin Al-Harith) added some phrases not mentioned by the others in the Hadith.  

كَانَ النَّبِيُّ ﷺ يُصَلِّي فِيمَا بَيْنَ أَنْ يَفْرُغَ مِنْ صَلاَةِ الْعِشَاءِ إِلَى الْفَجْرِ إِحْدَى عَشْرَةَ رَكْعَةً يُسَلِّمُ بَيْنَ كُلِّ رَكْعَتَيْنِ وَيُوتِرُ بِوَاحِدَةٍ وَيَسْجُدُ سَجْدَةً قَدْرَ مَا يَقْرَأُ أَحَدُكُمْ خَمْسِينَ آيَةً ثُمَّ يَرْفَعُ رَأْسَهُ فَإِذَا سَكَتَ الْمُؤَذِّنُ مِنْ صَلاَةِ الْفَجْرِ وَتَبَيَّنَ لَهُ الْفَجْرُ رَكَعَ رَكْعَتَيْنِ خَفِيفَتَيْنِ ثُمَّ اضْطَجَعَ عَلَى شِقِّهِ الأَيْمَنِ حَتَّى يَأْتِيَهُ الْمُؤَذِّنُ بِالإِقَامَةِ فَيَخْرُجُ مَعَهُ وَبَعْضُهُمْ يَزِيدُ عَلَى بَعْضٍ فِي الْحَدِيثِ  

He would observe witr with a single rak'ah and make a prostration as long as you would take to recite fifty verses before raising his head. When the mu'adhdhin finished his call for the dawn prayer and the dawn became clear to him.... Then the narrator transmitted the rest of the tradition to the same effect. Some narrators added something more in their version.  

وَيُوتِرُ بِوَاحِدَةٍ وَيَسْجُدُ سَجْدَةً قَدْرَ مَا يَقْرَأُ أَحَدُكُمْ خَمْسِينَ آيَةً قَبْلَ أَنْ يَرْفَعَ رَأْسَهُ فَإِذَا سَكَتَ الْمُؤَذِّنُ مِنْ صَلاَةِ الْفَجْرِ وَتَبَيَّنَ لَهُ الْفَجْرُ وَسَاقَ مَعْنَاهُ قَالَ وَبَعْضُهُمْ يَزِيدُ عَلَى بَعْضٍ  

It was narrated that ‘Aishah said, and this is the Hadith of Abu Bakr. “During the period after he finished the ‘Isha’ prayer until the Fajr, the Prophet ﷺ used to pray eleven Rak’ah, saying the Salam after each two Rak’ah and praying Witr with one Rak’ah. He would prostrate for as long as it takes anyone of you to recite fifty Verses before he would raise his head. When the Mu’adh-dhin fell silent after the first Adhan for the Subh prayer, he would get up and pray two brief Rak’ah.”  

كَانَ النَّبِيُّ ﷺ يُصَلِّي مَا بَيْنَ أَنْ يَفْرُغَ مِنْ صَلاَةِ الْعِشَاءِ إِلَى الْفَجْرِ إِحْدَى عَشْرَةَ رَكْعَةً يُسَلِّمُ فِي كُلِّ اثْنَتَيْنِ وَيُوتِرُ بِوَاحِدَةٍ وَيَسْجُدُ فِيهِنَّ سَجْدَةً بِقَدْرِ مَا يَقْرَأُ أَحَدُكُمْ خَمْسِينَ آيَةً قَبْلَ أَنْ يَرْفَعَ رَأْسَهُ فَإِذَا سَكَتَ الْمُؤَذِّنُ مِنَ الأَذَانِ الأَوَّلِ مِنْ صَلاَةِ الصُّبْحِ قَامَ فَرَكَعَ رَكْعَتَيْنِ خَفِيفَتَيْنِ  

"عَنْ عَائِشَةَ: أَنَّ رَسُولَ اللهِ ﷺ كَانَ يُصَلِّي فِيمَا بَيْنَ أَنْ يَفْرَغَ مِنَ العِشَاءِ الآخِرَةِ إِلَى أَنْ يَنْصَدِعَ الْفَجْرُ إِحْدَى عَشْرَةَ رَكَعْةً، يُسَلِّمُ مِنْ كُلِّ ثِنْتَيْنِ، وَيُوتِرُ بِوَاحِدَةٍ، وَيَمْكُثُ فِي سُجُودِهِ بِقَدْرِ مَا يَقْرَأُ أَحَدُكُمْ خَمْسِينَ آيَةً قَبْلَ أَنْ يَرْفَع رَأسَهُ".