(5) Prayer (Kitab Al-Salat): Voluntary Prayers
كتاب التطوع
(467) Chapter: On The Night Prayer
(27) باب فِي صَلاَةِ اللَّيْلِ
Sunan Abi Dawud 1345 
This tradition has also been transmitted by Sa'id through a different chain of narrators to the same effect. Ibn Bashshar narrated the tradition like that of Yahya b. Sa'id. His version has:
He uttered the salutation in a way that we could hear it.
حَدَّثَنَا مُحَمَّدُ بْنُ بَشَّارٍ، حَدَّثَنَا ابْنُ أَبِي عَدِيٍّ، عَنْ سَعِيدٍ، بِهَذَا الْحَدِيثِ قَالَ ابْنُ بَشَّارٍ بِنَحْوِ حَدِيثِ يَحْيَى بْنِ سَعِيدٍ إِلاَّ أَنَّهُ قَالَ ‏:‏ وَيُسَلِّمُ تَسْلِيمَةً يُسْمِعُنَا ‏.‏
Grade :  Sahih (Al-Albani) صحيح  (الألباني)حكم :
Reference : Sunan Abi Dawud 1345
In-book reference : Book 5, Hadith 96
English translation : Book 5, Hadith 1340