[Machine] The Messenger of Allah ﷺ said, "The night prayer is to be performed in pairs. If you see that dawn is about to break, then offer one odd-numbered prayer." I asked Ibn Umar, "What is meant by 'in pairs'?" He replied, "Offering the salaam (salutation) in every two units of prayer." According to the narration of Adam, he said, "Offer one odd-numbered prayer." Then a man asked Ibn Umar, "What is meant by 'in pairs'?" He replied, "Offering the salaam between every two units of prayer." It is narrated in its chain of transmission from Shu'bah that Uqbah bin Hareth said, "He (the Prophet) said..." (the rest of the sentence is cut off)  

أَنَّ رَسُولَ اللهِ ﷺ قَالَ صَلَاةُ اللَّيْلِ مَثْنَى مَثْنَى فَإِذَا رَأَيْتَ أَنَّ الصُّبْحَ يُدْرِكُكَ فَأَوْتِرْ بِوَاحِدَةٍ قُلْتُ لِابْنِ عُمَرَ مَا مَثْنَى مَثْنَى؟ قَالَ مُتَسَلِّمٌ فِي كُلِّ رَكْعَتَيْنِ لَفْظُ حَدِيثِ ابْنِ بَشَّارٍ وَفِي رِوَايَةِ آدَمَ فَأَوْتِرْ بِرَكْعَةٍ فَقَالَ رَجُلٌ لِابْنِ عُمَرَ مَا مَثْنَى مَثْنَى؟ فَقَالَ السَّلَامُ بَيْنَ كُلِّ رَكْعَتَيْنِ وَقَالَ فِي إِسْنَادِهِ عَنْ شُعْبَةَ ثنا عُقْبَةُ بْنُ حُرَيْثٍ قَالَ يَقُولُ قَالَ رَسُولُ اللهِ ﷺ