Musnad Ahmad Hadith 23017

It is narrated from Buraidah (may Allah be pleased with him) that once we were with the Noble Prophet (ﷺ). We halted at a place, and at that time we were about a thousand horsemen. The Noble Prophet (ﷺ) performed two rak‘ahs and then turned towards us; his eyes were filled with tears. Umar (may Allah be pleased with him) stood up and, sacrificing his parents for him, asked, "O Messenger of Allah! What is the matter?" The Noble Prophet (ﷺ) said, "I asked my Lord for permission to pray for forgiveness for my mother, but I was not granted permission, so out of compassion my eyes filled with tears. And I had forbidden you from three things: from visiting graveyards, but now you may go, so that you may remember the Hereafter; I had forbidden you from eating the meat of sacrifice after three days, but now eat it and keep it as long as you wish; and I had forbidden you from drinking from specific vessels, but now drink from whichever vessel you wish, but do not drink anything intoxicating."