Jabir bin Abdullah reported,

The Messenger of Allah ﷺ came out to his companions one night while they were waiting for the evening prayer and said, "The people have prayed and gone to sleep, while you have been waiting for it. You are considered to be in prayer as long as you wait for it."Then he said, "Were it not for the weakness of the weak and the age of the elderly, I would have delayed this prayer until the middle of the night."

Azami 1839

Sahih

عن جابر بن عبد الله قال

خرج رسول الله ﷺ على أصحابه ذات ليلة وهم ينتظرون العشاء فقال: صلى الناس ورقدوا، وأنتم تنتظرونها، أما إنكم في صلاة ما انتظرتموها ثم قال: لولا ضعف الضعيف، وكبر الكبير، لأخرت هذه الصلاة إلى شطر الليل.

الأعظمي 1839صحيح
Contents
Reference
Commentary
Ayat
Collection
Jami al-Kamil
Book
Prayer
Chapter
Prayer times
Section
Isha prayer, its time and delaying it
Numbering
Jami al-Kamil 1839 (2nd edition)
Azami 1839