Sunan an-Nasa'i
Book 13: The Book of Forgetfulness (In Prayer)
كتاب السهو
188 hadith in this book
Chapter 65 Another kind of remembrance after the tashahhud
باب نَوْعٌ آخَرُ مِنَ الذِّكْرِ بَعْدَ التَّشَهُّدِ
It was narrated from Jabir that: The Messenger of Allah (ﷺ) used to say in his prayer, after the tashahhud: "The best of word is the word of Allah (SWT) and the best of guidance is the guidance of Muhammad (ﷺ)."
أَخْبَرَنَا عَمْرُو بْنُ عَلِيٍّ، قَالَ حَدَّثَنَا يَحْيَى، عَنْ جَعْفَرِ بْنِ مُحَمَّدٍ، عَنْ أَبِيهِ، عَنْ جَابِرٍ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم كَانَ يَقُولُ فِي صَلاَتِهِ بَعْدَ التَّشَهُّدِ " أَحْسَنُ الْكَلاَمِ كَلاَمُ اللَّهِ وَأَحْسَنُ الْهَدْىِ هَدْىُ مُحَمَّدٍ صلى الله عليه وسلم " .
Hadith text, translations and grading are courtesy of Sunnah.com.