(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." (TR)
Reference (TR): Jami` at-Tirmidhi 457, 458 (TR)
In-book reference (TR): Book 3, Hadith 6 (TR)
English translation (TR): Vol. 1, Book 3, Hadith 457 (TR)