It is narrated from Sayyiduna Ibn Umar (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) said: "I saw in a dream that I was given a large bowl full of milk, and I drank from it until I was filled, until I saw it flowing in my veins between the skin and the flesh. Then some was left over, and I gave it to Umar bin al-Khattab. So interpret it." The Companions said: O Prophet of Allah, its interpretation is that this is knowledge which Allah has given you and filled you with, and what was left over you gave to Umar bin al-Khattab. He (peace and blessings be upon him) said: "You are right."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 13098