I went on an expedition with the Messenger of Allah ﷺ, and I was present with him at the conquest. He stayed eighteen days in Mecca and prayed only two rak'ahs (at each time of prayer). And he said: You who live in the town must pray four; we are travellers.  

غَزَوْتُ مَعَ رَسُولِ اللَّهِ ﷺ وَشَهِدْتُ مَعَهُ الْفَتْحَ فَأَقَامَ بِمَكَّةَ ثَمَانِيَ عَشْرَةَ لَيْلَةً لاَ يُصَلِّي إِلاَّ رَكْعَتَيْنِ وَيَقُولُ يَا أَهْلَ الْبَلَدِ صَلُّوا أَرْبَعًا فَإِنَّا قَوْمٌ سَفْرٌ  

The Messenger of Allah ﷺ had a stop of seventeen days in Mecca and he shortened the prayer (i.e. prayed two rak'ahs at each time of prayer). Ibn Abbas said: He who stays seventeen days should shorten the prayer; and who stays more than that should offer complete prayer. Abu Dawud said: The other version transmitted by Ibn 'Abbas through a different chain adds: He (the Prophet) had a stop of nineteen days (in Mecca).  

أَنَّ رَسُولَ اللَّهِ ﷺ أَقَامَ سَبْعَ عَشْرَةَ بِمَكَّةَ يَقْصُرُ الصَّلاَةَ قَالَ ابْنُ عَبَّاسٍ وَمَنْ أَقَامَ سَبْعَ عَشْرَةَ قَصَرَ وَمَنْ أَقَامَ أَكْثَرَ أَتَمَّ  

The Messenger of Allah ﷺ stayed fifteen days in Mecca in the year of Conquest. Shortening the prayer. Abu Dawud said: This tradition has also been transmitted by 'Abdah b. Sulaiman, Ahmad b. Khalid al-Wahbi, and Salamah b. Fadli on the authority of Ibn Ishaq ; but they did not mention the name of Ibn 'Abbas.  

أَقَامَ رَسُولُ اللَّهِ ﷺ بِمَكَّةَ عَامَ الْفَتْحِ خَمْسَ عَشْرَةَ يَقْصُرُ الصَّلاَةَ  

The Messenger of Allah ﷺ stayed in Mecca seventeen days and prayed two rak'ahs (at each time of prayer).  

أَنَّ رَسُولَ اللَّهِ ﷺ أَقَامَ بِمَكَّةَ سَبْعَ عَشْرَةَ يُصَلِّي رَكْعَتَيْنِ  

We went out from Medina to Mecca with the Messenger of Allah ﷺ and he prayed two rak'ahs (at each time of prayer) till we returned to Medina. We (the people) said: Did you stay there for some time ? He replied: We stayed there ten days.  

خَرَجْنَا مَعَ رَسُولِ اللَّهِ ﷺ مِنَ الْمَدِينَةِ إِلَى مَكَّةَ فَكَانَ يُصَلِّي رَكْعَتَيْنِ حَتَّى رَجَعْنَا إِلَى الْمَدِينَةِ فَقُلْنَا هَلْ أَقَمْتُمْ بِهَا شَيْئًا قَالَ أَقَمْنَا بِهَا عَشْرًا  

Muhammad reported from his father, Umar, on the authority of his grandfather, Ali ibn AbuTalib: When Ali travelled, he continued to travel till it became nearly dark. He then alighted and offered the sunset prayer. Then he would call for his dinner and eat it. Then he prayed the night prayer and then moved off. He would say: This is how the Messenger of Allah ﷺ used to do. Usamah ibn Zayd reported from Hafs ibn Ubaydullah, the son of Anas ibn Malik: Anas would combine them (the evening and night prayer) when the twilight disappeared. He said: The Prophet ﷺ used to do so. Az-Zuhri also reported similarly on the authority of Anas from the Prophet ﷺ.  

أَنَّ عَلِيًّا ؓ كَانَ إِذَا سَافَرَ سَارَ بَعْدَ مَا تَغْرُبُ الشَّمْسُ حَتَّى تَكَادَ أَنْ تُظْلِمَ ثُمَّ يَنْزِلُ فَيُصَلِّي الْمَغْرِبَ ثُمَّ يَدْعُو بِعَشَائِهِ فَيَتَعَشَّى ثُمَّ يُصَلِّي الْعِشَاءَ ثُمَّ يَرْتَحِلُ وَيَقُولُ هَكَذَا كَانَ رَسُولُ اللَّهِ ﷺ يَصْنَعُ قَالَ عُثْمَانُ عَنْ عَبْدِ اللَّهِ بْنِ مُحَمَّدِ بْنِ عُمَرَ بْنِ عَلِيٍّ سَمِعْتُ أَبَا دَاوُدَ يَقُولُ وَرَوَى أُسَامَةُ بْنُ زَيْدٍ عَنْ حَفْصِ بْنِ عُبَيْدِ اللَّهِ يَعْنِي ابْنَ أَنَسِ بْنِ مَالِكٍ أَنَّ أَنَسًا كَانَ يَجْمَعُ بَيْنَهُمَا حِينَ يَغِيبُ الشَّفَقُ وَيَقُولُ كَانَ النَّبِيُّ ﷺ يَصْنَعُ ذَلِكَ وَرِوَايَةُ الزُّهْرِيِّ عَنْ أَنَسٍ عَنِ النَّبِيِّ ﷺ مِثْلُهُ