ENOfficial
Ibn ‘Abbas reported the Prophet (ﷺ) as saying, “Seek lailat al-qadr in the last ten nights of Ramadan, on the twenty-first, twenty-third and twenty-fifth.” Bukhari transmitted it.
Source: sunnah.com
Other translations
Arabic
وَعَنِ ابْنِ عَبَّاسٍ أَنَّ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ: الْتَمِسُوهَا فِي الْعَشْرِ الْأَوَاخِرِ مِنْ رَمَضَانَ لَيْلَةَ الْقَدْرِ: فِي تَاسِعَةٍ تَبْقَى فِي سَابِعَةٍ تَبْقَى فِي خَامِسَةٍ تَبْقَى. رَوَاهُ البُخَارِيّ
sunnah.com