Muḥammad b. al-Ṣalt > Ibn al-Mubārak > Yūnus > al-Zuhrī > Ḥamzah b. ʿAbdullāh b. ʿUmar > Ibn ʿUmar

"I heard the Prophet ﷺ say that while I was asleep, I was brought a cup of milk, and I drank from it until I could see the whiteness in my nails or he said, in my finger nails. Then I handed the remaining portion to Umar. They asked, 'O Messenger of Allah, what did you interpret from this?' He said, 'Knowledge.'" – Sound Chain

أَخْبَرَنَا مُحَمَّدُ بْنُ الصَّلْتِ حَدَّثَنَا ابْنُ الْمُبَارَكِ عَنْ يُونُسَ عَنْ الزُّهْرِيِّ عَنْ حَمْزَةَ بْنِ عَبْدِ اللَّهِ بْنِ عُمَرَ عَنْ ابْنِ عُمَرَ قَالَ

سَمِعْتُ النَّبِيَّ ﷺ يَقُولُ بَيْنَا أَنَا نَائِمٌ إِذْ أُتِيتُ بِقَدَحٍ مِنْ لَبَنٍ فَشَرِبْتُ مِنْهُ حَتَّى إِنِّي لَأَرَى الرِّيَّ فِي ظُفْرِي أَوْ قَالَ فِي أَظْفَارِي ثُمَّ نَاوَلْتُ فَضْلَهُ عُمَرَ فَقَالُوا يَا رَسُولَ اللَّهِ مَا أَوَّلْتَهُ قَالَ «الْعِلْمَ» – إسناده صحيح