Mishkat al-Masabih 2088

Translation

Zirr b. Hubaish said: I questioned Ubayy b. Ka'b about a statement by his brother [not actual brother] Ibn Mas'ud to the effect that anyone who gets up for prayer every night in the year will hit upon lailat al-qadr, and he replied, “God have mercy on him! He meant that people should not content themselves [with that might alone]. He knew that it was in Ramadan among the last ten nights and that it was the twenty-seventh.” He then swore without any reservation that it was the twenty-seventh, and when I asked, “On what ground do you state that, Abul Mundhir? [Ubayy's kunya ]” he replied, “By the indication (or sign)* of which God’s messenger informed us, viz. that the sun rises on that day without rays.” *An alternative, the transmitter not being sure which word was used. *An alternative, the transmitter not being sure which word was used. Muslim transmitted it.

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Same hadith, other wordings

• Shahih Muslim 762dمَنْ يَقُمِ الْحَوْلَ يُصِبْ لَيْلَةَ الْقَدْرِ فَقَالَ رَحِمَهُ اللَّهُ أَرَادَ أَنْ لاَ يَتَّكِلَ النَّاسُ أَمَا إِنَّهُ قَدْ عَلِمَ أَنَّهَا فِي رَمَضَانَ وَأَنَّهَا فِي الْعَشْرِ الأَوَاخِرِ وَأَنَّهَا لَيْلَةُ سَبْعٍ وَعِشْرِينَ ثُمَّ