(5) باب مَا جَاءَ فِي الْوِتْرِ بِسَبْعٍ
Umm Salamah narrated:
"The Prophet would perform Witr with thirteen [Rak'ah]. When he was older and became weak he performed Witr with seven." (DE)
Reference (DE): Jami` at-Tirmidhi 457, 458 (DE)
In-book reference (DE): Book 3, Hadith 6 (DE)
English translation (DE): Vol. 1, Book 3, Hadith 457 (DE)