Volume 1, Book 11, Number 671:
Narrated Abu Huraira:
Allah’s Apostle said, “If anyone of you leads the people in the prayer, he should shorten it for
amongst them are the weak, the sick and the old; and if anyone among your prays alone then he may
prolong (the prayer) as much as he wishes. ”
Volume 1 – 168 / 1700
SAHIH BUKHARI VOLUME 1 > BOOK 11: CALL TO PRAYERS (ADHAAN)