Narrated 'Aishah (RA):

The Prophet (ﷺ) delayed (the 'Isha' prayer) one night till a great part of the night passed, then he went out and offered the prayer, and said, "This is the proper time for it; were it not that I would impose a burden on my followers." [Reported by Muslim].

وَعَنْ عَائِشَةَ رَضِيَ اَللَّهُ عَنْهَا قَالَتْ: { أَعْتَمَ رَسُولُ اَللَّهِ ‏- صلى الله عليه وسلم ‏-ذَاتَ لَيْلَةٍ بِالْعَشَاءِ, حَتَّى ذَهَبَ عَامَّةُ اَللَّيْلِ, ثُمَّ خَرَجَ, فَصَلَّى, وَقَالَ:

إِنَّهُ لَوَقْتُهَا لَوْلَا أَنْ أَشُقَّ عَلَى أُمَّتِي

} رَوَاهُ مُسْلِمٌ [1]‏ .‏