Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
bayhaqi:8542 – Abū ʿAbdullāh al-Ḥāfiẓ And ʾAbū Saʿīd b. Abū ʿAmr > Abū al-ʿAbbās > al-Aṣam > Asīd b. ʿĀṣim > al-Ḥusayn b. Ḥafṣ > Sufyān > al-Aʿmash > Ibrāhīm > al-Aswad

[Machine] Abdullah said, "Seek the Night of Qadr on the seventeenth, nineteenth, or twenty-first night of the lunar month."  

البيهقي:٨٥٤٢ – وَأَخْبَرَنَا أَبُو عَبْدِ اللهِ الْحَافِظُ وَأَبُو سَعِيدِ بْنُ أَبِي عَمْرٍو قَالَا ثنا أَبُو الْعَبَّاسِ هُوَ الْأَصَمُّ ثنا أَسِيدُ بْنُ عَاصِمٍ ثنا الْحُسَيْنُ بْنُ حَفْصٍ عَنْ سُفْيَانَ عَنِ الْأَعْمَشِ عَنْ إِبْرَاهِيمَ عَنِ الْأَسْوَدِ قَالَ

قَالَ عَبْدُ اللهِ تَحَرَّوْا لَيْلَةَ الْقَدْرِ لَيْلَةَ سَبْعَةَ عَشَرَ صَبِيحَةَ بَدْرٍ أَوْ إِحْدَى وَعِشْرِينَ أَوْ ثَلَاثًا وَعِشْرِينَ  

See similar narrations below:

Collected by Ṭabarānī
tabarani:9579 – Isḥāq b. Ibrāhīm > ʿAbd al-Razzāq > al-Thawrī > al-Aʿmash > Ibrāhīm > al-Aswad

[Machine] Abdullah bin Mas'ud said, "Seek Laylat al-Qadr on the night of the seventeenth or the night of the nineteenth or the night of the twenty-first."  

الطبراني:٩٥٧٩ – حَدَّثَنَا إِسْحَاقُ بْنُ إِبْرَاهِيمَ عَنْ عَبْدِ الرَّزَّاقِ عَنِ الثَّوْرِيِّ عَنِ الْأَعْمَشِ عَنْ إِبْرَاهِيمَ عَنِ الْأَسْوَدِ قَالَ قَالَ

عَبْدُ اللهِ بْنُ مَسْعُودٍ «تَحَرَّوْا لَيْلَةَ الْقَدْرِ لَيْلَةَ سَبْعَ عَشْرَةَ صَبِيحَةَ بَدْرٍ أَوْ إِحْدَى وَعِشْرِينَ لَيْلَةً أَوْ ثَلَاثٍ وَعِشْرِينَ»