I heard Messenger of Allah ﷺ saying, "While I was sleeping, I saw a bowl full of milk was brought to me and I drank of it (to my fill) till I noticed its wetness flowing (in my body). Then I gave the remaining of it to ʿUmar." They asked, "O Messenger of Allah ﷺ! What have you interpreted (about the dream)? He said, "(It is Religious) knowledge." (See Hadith No. 134) (Using translation from Bukhārī 7027)
عَنْ أَبِيهِ كَانَ النَّبِيُّ ﷺ يُحَدِّثُ قَالَ «بَيْنَا أَنَا نَائِمٌ رَأَيْتُ أَنِّي أُتِيتُ بِقَدَحٍ فَشَرِبْتُ مِنْهُ حَتَّى أَنِّي أَرَى الرِّيَّ يَجْرِي ثُمَّ إِنِّي أَعْطَيْتُ فَضْلِي عُمَرَ» قَالُوا فَمَا أَوَّلْتَهُ يَا رَسُولَ اللهِ ﷺ؟ قَالَ «الْعِلْمُ»