Hadith 544
وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ نَافِعٍ، أَنَّ عَبْدَ اللَّهِ بْنَ عُمَرَ، كَانَ إِذَا صَلَّى عَلَى الْجَنَائِزِ يُسَلِّمُ حَتَّى يُسْمِعَ مَنْ يَلِيهِ .
Yahya related to me from Malik from Nafi that Abdullah ibn Umar, when he prayed over the dead, would say, "Peace be upon you" loud enough for whoever was near to him to hear
Mauquf Sahih (Salim al-Hilali)
Muwatta Malik 544 · Book 16, Hadith 25