Hadith 1305
Chapter 457: The Abrogation Of The (Obligation Of) Night Prayer And Facilitation (Of Choice) Regarding It - كتاب التطوع
حَدَّثَنَا أَحْمَدُ بْنُ مُحَمَّدٍ، - يَعْنِي الْمَرْوَزِيَّ - حَدَّثَنَا وَكِيعٌ، عَنْ مِسْعَرٍ، عَنْ سِمَاكٍ الْحَنَفِيِّ، عَنِ ابْنِ عَبَّاسٍ، قَالَ لَمَّا نَزَلَتْ أَوَّلُ الْمُزَّمِّلِ كَانُوا يَقُومُونَ نَحْوًا مِنْ قِيَامِهِمْ فِي شَهْرِ رَمَضَانَ حَتَّى نَزَلَ آخِرُهَا وَكَانَ بَيْنَ أَوَّلِهَا وَآخِرِهَا سَنَةٌ .
Narrated Ibn 'Abbas:
When the opening verses of Surah Al-muzammil was revealed, the Companions would pray as long as they would pray during Ramadan until its last verses were revealed. The period between the revelation of its opening and the last verses was one year.
Reference : Sunan Abi Dawud 1305
In-book reference : Book 5, Hadith 56