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."  

سَمِعْتُ رَسُولَ اللَّهِ ﷺ قَالَ بَيْنَا أَنَا نَائِمٌ أُتِيتُ بِقَدَحِ لَبَنٍ فَشَرِبْتُ حَتَّى إِنِّي لأَرَى الرِّيَّ يَخْرُجُ فِي أَظْفَارِي ثُمَّ أَعْطَيْتُ فَضْلِي عُمَرَ بْنَ الْخَطَّابِ قَالُوا فَمَا أَوَّلْتَهُ يَا رَسُولَ اللَّهِ قَالَ الْعِلْمَ