Umar (may Allah be pleased with him) consulting Abd al-Rahman bin Awf (may Allah be pleased with him) on fatwa, and the advice to beware the slip of youth

Salim narrates: I said to Sayyiduna Abdullah bin Umar (may Allah be pleased with them both).

It is narrated from Qabisah bin Jabir al-Asadi that he said: I was in the state of ihram when I saw a deer. I struck it (with a stone or an arrow), and it hit the base of its horn, and it died. I felt uneasy in my heart about this, so I came to Sayyiduna Umar bin al-Khattab (may Allah be pleased with him) to ask about the matter. I found a man of fair complexion with a gentle face sitting beside him, and he was Sayyiduna Abd al-Rahman bin Awf (may Allah be pleased with him). I asked Sayyiduna Umar, and he turned to Abd al-Rahman and asked: "Do you think one sheep (as expiation) is sufficient for him?" He said: "Yes." So he ordered me to slaughter a sheep. When we got up from his presence, a companion of mine said: "The Commander of the Faithful could not give you a fatwa himself until he asked that man." Sayyiduna Umar (may Allah be pleased with him) overheard part of what he said, and he gave him a sound beating with his whip. Then he came towards me to beat me, and I said: "O Commander of the Faithful! I did not say anything; it was he who said it." So he left me. Then he said: "You killed game while in the state of ihram, and now you object to the fatwa?!" Then the Commander of the Faithful said: "In a person there are ten traits, nine of which are good and one bad, and that one bad trait ruins all the rest." Then he said: "Beware of the slips of youth."
This hadith is sahih (authentic) on the condition of the two Shaykhs (Bukhari and Muslim), but they did not record it.