صحيح مسلم 1047

Hammam b. Munabbih reported:This is what Abu Huraira transmitted to us from Muhammad the Messenger of Allah (ﷺ), and he narrated (some) ahadith out of (these narrations and one of them is this): The Messenger of Allah (ﷺ) said: When any one of you stands to lead people In prayer, he should shorten it, for amongst them are the aged, and amongst them are the weak, but when he prays by himself, he may prolong his prayer as he likes

Rapporté par Hammam b. Munabbih : Voici ce qu’Abu Huraira nous a transmis de Muhammad, le Messager d’Allah ﷺ, et il a rapporté certains ahadith dont celui-ci : Le Messager d’Allah ﷺ a dit : « Quand l’un d’entre vous dirige la prière, il doit la raccourcir, car il y a parmi eux des personnes âgées et des faibles. Mais quand il prie seul, il peut la prolonger comme il veut. »