Narrator:Abdullāh ibn ‘Umar
وَعَنِ ابْنِ عُمَرَ قَالَ: سَمِعْتُ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسلم يَقُول: «بَيْنَا أَنَا نَائِمٌ أُتِيتُ بِقَدَحِ لَبَنٍ فَشَرِبْتُ حَتَّى إِنِّي لَأَرَى الرِّيَّ يَخْرُجُ فِي أَظْفَارِي ثُمَّ أَعْطَيْتُ فَضْلِي عُمَرَ بْنَ الْخَطَّابِ» قَالُوا: فَمَا أَوَّلْتَهُ يَا رَسُولَ اللَّهِ؟ قَالَ: «الْعِلْمَ» . مُتَّفق عَلَيْهِ
Ibn 'Umar told that he heard God's messenger say, "While I was asleep I was brought a jug of milk and drank till I could see what was drunk coming out at my nails. Then I gave what I had left to `Umar b. al-Khattab." He was asked how he interpreted it and replied that it meant knowledge. (Bukhari and Muslim.)
Reported by Al-Bukhari (No. 82, 7006, 7007, 7027, 7032), Muslim (No. 2391a), At-Tirmidhi (No. 2284, 3687), Ahmad (No. 5295, 5602, 5868, 6059, 6138) and Ad-Darimi (No. 2060). Cited in Mishkat al-Masabih (No. 6039).