It is narrated from Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) concerning this saying of Allah, the Mighty and Majestic, "They used to sleep but little of the night" [Surah al-Dhariyat: 17] , that he said: "No night passed over them in which they slept until morning without praying in it (that is, they would certainly spend some part of the night in worship)." This hadith is sahih (authentic) on the condition of the two Shaykhs (Bukhari and Muslim), but they did not record it, and it also has a supporting narration (shahid) with a connected chain from another route.