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suyuti:15696a
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السيوطي:١٥٦٩٦a

"عَلَيكُمْ بِصَلاةِ اللَّيلِ ولَو رَكعةً واحِدَةً".  

ابن نصر في الصلاة، [طب] الطبرانى في الكبير عن ابن عباس

See similar narrations below:

Collected by Aḥmad's Zuhd
ahmad-zuhd:85ʿAbdullāh > Muḥammad b. ʿAbbād al-Makkī > Ḥātim / Ibn Ismāʿīl > Ibn ʿAjlān > Ḥusayn b. ʿAbdullāh > ʿIkrimah > Ibn ʿAbbās

[Machine] That the Prophet ﷺ said, "You should perform the night prayer, even if it is only one unit (rak'ah)."  

الزهد لأحمد:٨٥حَدَّثَنَا عَبْدُ اللَّهِ حَدَّثَنَا مُحَمَّدُ بْنُ عَبَّادٍ الْمَكِّيُّ أَخْبَرَنَا حَاتِمٌ يَعْنِي ابْنَ إِسْمَاعِيلَ عَنِ ابْنِ عَجْلَانَ عَنْ حُسَيْنِ بْنِ عَبْدِ اللَّهِ عَنْ عِكْرِمَةَ عَنِ ابْنِ عَبَّاسٍ

أَنَّ النَّبِيَّ ﷺ قَالَ «عَلَيْكُمْ بِصَلَاةِ اللَّيْلِ وَلَوْ رَكْعَةً وَاحِدَةً»