I heard Messenger of Allah ﷺ saying, "While I was sleeping, I saw that a cup full of milk was brought to me and I drank of it and gave the remaining of it to ʿUmar bin Al-Khattab." They asked. What have you interpreted (about the dream)? O Messenger of Allah ﷺ?" The Prophet ﷺ said. "(It is Religious) knowledge."  

سَمِعْتُ رَسُولَ اللَّهِ ﷺ يَقُولُ بَيْنَا أَنَا نَائِمٌ أُتِيتُ بِقَدَحِ لَبَنٍ فَشَرِبْتُ مِنْهُ ثُمَّ أَعْطَيْتُ فَضْلِي عُمَرَ بْنَ الْخَطَّابِ قَالُوا فَمَا أَوَّلْتَهُ يَا رَسُولَ اللَّهِ قَالَ الْعِلْمَ