Messenger of Allah ﷺ said, "While I was sleeping, I saw that a cup full of milk was brought to me and I drank my fill till I noticed (the milk) its wetness coming out of my nails. Then I gave the remaining milk to ʿUmar Ibn Al-Khattab" The companions of the Prophet ﷺ asked, "What have you interpreted (about this dream)? "O Messenger of Allah ﷺ ,!" he replied, "(It is religious) knowledge." (Using translation from Bukhārī 82)
سَمِعْتُ رَسُولَ اللهِ ﷺ قَالَ «بَيْنَا أَنَا نَائِمٌ أُتِيتُ بِقَدَحٍ مِنْ لَبَنٍ فَشَرِبْتُ مِنْهُ حَتَّى إِنِّي لَأَرَى الرِّيَّ يَجْرِي فِي أَظْفَارِي ثُمَّ أَعْطَيْتُ فَضْلِي عُمَرَ» قَالُوا فَمَا أَوَّلْتَ ذَلِكَ؟ قَالَ «الْعِلْمَ»