حَدَّثَنَا عَبْدُ الرَّزَّاقِ حَدَّثَنَا مَعْمَرٌ عَنْ الزُّهْرِيِّ عَنْ سَالِمٍ عَنِ ابْنِ عُمَرَ أَنَّ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ الْتَمِسُوا لَيْلَةَ الْقَدْرِ فِي الْعَشْرِ الْغَوَابِرِ فِي التِّسْعِ الْغَوَابِرِ
مسند امام احمد بن حنبل · Hadith 4925
It was narrated from Ibn 'Umar that the Prophet (PBUH) said: "Seek Laylat al-Qadr in the last ten nights, in the last nine.
Translated by Dr. Muhammad Muhsin Khan · Reviewed by Islamic University of Madinah · Published March 2020