Hadith 2543

(حديث مرفوع) حَدَّثَنَا عَفَّانُ ، حَدَّثَنَا عَبْدُ الْوَاحِدِ بْنُ زِيَادٍ ، حَدَّثَنَا عَاصِمٌ الْأَحْوَلُ ، عَنْ لَاحِقِ بْنِ حُمَيْدٍ ، وَعِكْرِمَةَ , قَالَا : قَالَ عُمَرُ : مَنْ يَعْلَمُ مَتَى لَيْلَةُ الْقَدْرِ ؟ قَالَا : فقال بن عباس : قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ : " هِيَ فِي الْعَشْرِ ، فِي سَبْعٍ يَمْضِينَ ، أَوْ سَبْعٍ يَبْقَيْنَ " .
Once, Sayyiduna Umar Farooq (may Allah be pleased with him) asked: Who knows about Laylat al-Qadr, when does it occur? Upon this, Sayyiduna Ibn Abbas (may Allah be pleased with them both) said that the Messenger of Allah (peace and blessings be upon him) said: "Laylat al-Qadr is in the last ten nights of Ramadan, either after seven nights have passed (the twenty-seventh night) or when seven nights remain (the twenty-third night)."
Hadith Reference مسند احمد / ومن مسند بني هاشم / 2543
Hadith Grading حکم دارالسلام: إسناده صحيح، خ: 2022