كتاب المواقيت
Read the English translation first, with the original Arabic directly underneath.
It was narrated that 'Aishah the Mother of the Believers said:
"The Prophet (ﷺ) delayed the prayer one night until most of the night had passed and the people in the Masjid had gone home to sleep, then he went out and prayed, and said: 'This is indeed its (prayer) time, were it not that I would impose too much difficulty on my Ummah.'"
إِنَّهُ لَوَقْتُهَا لَوْلاَ أَنْ أَشُقَّ عَلَى أُمَّتِي