"Were it not that I would impose too much difficulty on my Ummah, I would have commanded them to delay 'Isha' and to use the Siwak for every prayer."
Sunan an-Nasa'i Book 6, Hadith 41
← Previous Hadith "The Messenger of Allah (ﷺ) used to delay the later 'Isha'."

It is described as the later 'Isha' prayer because the Maghrib prayer is sometimes called 'Isha' prayer, but it is the first 'Isha'. Some scholars are of the opinion that it is disliked to call Maghrib 'Isha' without qualifying it as the first 'Isha'. See Fath Al-Bari.

Sunan an-Nasa'i Book 6, Hadith 40 Next Hadith → "The Messenger of Allah (ﷺ) delayed A;-'Atamah one night, and 'Umar, may Allah be pleased with him, called out to him: 'The women and children have gone to sleep.' The Messenger of Allah (ﷺ) came out and said: 'No one is waiting for it except you.' At that time no prayer was offered except in Al-Madinah. Then he said: 'Pray it between the time when the twilight disappears and when one-third of the night has passed.'"

Sunan an-Nasa'i Book 6, Hadith 42