"We have sent it down," meaning: the Qur'an, "in a blessed night," meaning: the Night of Decree (Laylat al-Qadr).
Yahya narrated from Hammam ibn Yahya, from al-Kalbi, from Abu Salih, from Ibn Abbas who said: "The Qur'an descended on the Night of Decree to the lowest heaven in its entirety, then it began thereafter to descend in segments—three verses, four verses, five verses, and less than that or more. Then he recited this verse: 'So I swear by the setting of the stars.'"
﴿إِنَّا أَنزَلْنَاهُ﴾ يَعْنِي: الْقُرْآن ﴿فِي لَيْلَةٍ مُبَارَكَةٍ﴾ يَعْنِي: لَيْلَة الْقدر.
يَحْيَى: عَنْ هَمَّامِ بْنِ يَحْيَى، عَنِ الْكَلْبِيِّ، عَنْ أَبِي صَالحٍ [عَنِ] ابْنِ عَبَّاسٍ قَالَ: " نَزَلَ الْقُرْآنُ لَيْلَةَ الْقَدْرِ إِلَى السَّمَاءِ الدُّنْيَا جُمْلَةً وَاحِدَةً، ثُمَّ جَعَلَ بَعْدَ ذَلِكَ يَنْزِلُ نُجُومًا ثَلاثَ آيَاتٍ وَأَرْبَعَ آيَاتٍ وَخَمْسَ آيَاتٍ وَأَقَلَّ مِنْ ذَلِكَ وَأَكْثَرَ. ثُمَّ تَلا هَذِهِ الآيَةَ ﴿فَلا أُقْسِمُ بِمَوَاقِعِ النُّجُومِ﴾ ".
