Sahih al-Bukhari 3681
Sahih al-Bukhari · Book 62: Companions of the Prophet · The merits of 'Umar bin Al-Khattab رضي الله عنه
Narrated Hamza's father:
حَدَّثَنِي مُحَمَّدُ بْنُ الصَّلْتِ أَبُو جَعْفَرٍ الْكُوفِيُّ ، حَدَّثَنَا ابْنُ الْمُبَارَكِ ، عَنْ يُونُسَ ، عَنِ الزُّهْرِيِّ ، قَالَ أَخْبَرَنِي حَمْزَةُ ، عَنْ أَبِيهِ ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ " بَيْنَا أَنَا نَائِمٌ شَرِبْتُ ـ يَعْنِي اللَّبَنَ ـ حَتَّى أَنْظُرُ إِلَى الرِّيِّ يَجْرِي فِي ظُفُرِي أَوْ فِي أَظْفَارِي، ثُمَّ نَاوَلْتُ عُمَرَ ". فَقَالُوا فَمَا أَوَّلْتَهُ قَالَ " الْعِلْمَ " .
Allah's Messenger (ﷺ) said, "While I was sleeping, I saw myself drinking (i.e. milk), and I was so contented that I saw the milk flowing through my nails. Then I gave (the milk) to `Umar." They (i.e. the companions of the Prophet) asked, "What do you interpret it?" He said, "Knowledge."