Musnad Ahmad 27:1735

Abu Ahmad al-Zubayri Muhammad ibn Abdullah narrated to us, Abu Shu'bah al-Tahhan, the neighbor of al-A'mash, narrated to us, from Abu al-Rabi' who said: I was with Ibn Umar at a funeral, and he heard the voice of a person shouting, so he sent for him and silenced him. I said: "O Abu Abd al-Rahman, why did you silence him?" He said: "The deceased is harmed by it until he enters his grave." I said to him: "I pray the morning prayer with you, then I turn and do not see the face of the person sitting next to me, then sometimes it becomes bright." He said: "That is how I saw the Messenger of Allah, peace and blessings of Allah be upon him, pray, and I liked to pray it as I saw the Messenger of Allah, peace and blessings of Allah be upon him, pray it."