Musnad Ahmad 1101:3

Ya'mar ibn Bishr narrated to us, Abdullah—meaning Ibn al-Mubarak—narrated to us, Safwan ibn 'Amr informed us, 'Abd al-Rahman ibn Jubayr ibn Nufayr narrated to me, from his father, who said: We sat with al-Miqdad ibn al-Aswad one day, and a man passed by him and said: "Blessed are these two eyes that saw the Messenger of Allah, may Allah bless him and grant him peace. By Allah, we wish we had seen what you saw and witnessed what you witnessed." Al-Miqdad became angry, and I began to wonder, for he had said nothing but good. Then he turned to him and said: "What compels a man to wish for a situation that Allah has kept him away from? He does not know, had he witnessed it, how he would have fared in it. By Allah, there were people who were present with the Messenger of Allah, may Allah bless him and grant him peace, whom Allah cast upon their faces into Hell, because they did not answer him nor did they believe him. Are you not grateful to Allah that He brought you forth knowing nothing but your Lord, believing in what your Prophet brought, and you have been spared the trials that others faced? By Allah, Allah sent the Prophet, may Allah bless him and grant him peace, in the most difficult state any prophet was ever sent in, during a period of cessation of messengers and a time of ignorance, when they did not consider any religion better than the worship of idols. He came with the Criterion (al-Furqan) by which He distinguished between truth and falsehood, and separated the father from his child, to the extent that a man would see his father, his child, or his brother as a disbeliever, while Allah had opened the lock of his heart to faith. He would know that if he (the relative) perished, he would enter the Fire, and his eyes would not find comfort while he knew that his loved one was in the Fire." And this is what Allah, the Almighty and Majestic, said: "Those who say, 'Our Lord, grant us from among our wives and offspring comfort to our eyes'" [Al-Furqan: 74].