Qays bin Abbad (may Allah have mercy on him) said: The Companions of the Messenger (peace and blessings be upon him) (may Allah be pleased with them) disliked raising the voice at funerals, at the time of fighting and at the time of dhikr (remembrance).
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الجنائز / 7182
Al-Aswad bin Shayban (may Allah have mercy on him) said: Al-Hasan (may Allah have mercy on him) was at the funeral of al-Nadr bin Anas (may Allah have mercy on him), and Ash'ath bin Sulaym al-Ijli (may Allah have mercy on him) said: "O Abu Sa'id! I like it that I hear no voice at funerals." He said: "You are indeed among the people of good."
Sa'id bin al-Musayyib, al-Hasan al-Basri, Sa'id bin Jubayr and Ibrahim al-Nakha'i (may Allah have mercy on them) disliked that it be said at a funeral: "Seek forgiveness for him, may Allah forgive you."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الجنائز / 7183