BAYHAQI 4767:
from ʿAbdullāh b. ʿUmar —
[Machine] A man from the Muslims asked the Messenger of Allah ﷺ, "O Messenger of Allah, how is the night prayer?" He replied, "Two by two, and if you fear the approach of dawn, then perform the odd prayer." Abdullah ibn Umar used to give salutations after every two units of prayer, then perform the odd prayer.
البيهقي ٤٧٦٧:
عن عبد الله بن عمر —
سَأَلَ رَجُلٌ مِنَ الْمُسْلِمِينَ رَسُولَ اللهِ ﷺ فَقَالَ يَا رَسُولَ اللهِ كَيْفَ صَلَاةُ اللَّيْلِ؟ فَقَالَ مَثْنَى مَثْنَى فَإِذَا خِفْتَ الصُّبْحَ فَأَوْتِرْ بِوَاحِدَةٍ وَكَانَ عَبْدُ اللهِ بْنُ عُمَرَ يُسَلِّمُ فِي كُلِّ رَكْعَتَيْنِ ثُمَّ يُوتِرُ بِوَاحِدَةٍ
hadithunlocked.com