ʿAisha said, "Once Messenger of Allah ﷺ delayed the ʿIsha' prayer till ʿUmar reminded him by saying, "The prayer!" The women and children have slept. Then the Prophet ﷺ came out and said, 'None amongst the dwellers of the earth has been waiting for it (the prayer) except you." ʿUrwa said, "Nowhere except in Medina the prayer used to be offered (in those days)." He further said, "The Prophet ﷺ used to offer the ʿIsha' prayer in the period between the disappearance of the twilight and the end of the first third of the night." (Using translation from Bukhārī 569)
أَعْتَمَ رَسُولُ اللهِ ﷺ لَيْلَةً بِالْعَتَمَةِ فَنَادَاهُ عُمَرُ نَامَ النِّسَاءُ وَالصِّبْيَانُ فَخَرَجَ رَسُولُ اللهِ ﷺ فَقَالَ «مَا يَنْتَظِرُهَا غَيْرُكُمْ» وَلَمْ تَكُنْ تُصَلَّى يَوْمَئِذٍ إِلَّا بِالْمَدِينَةِ ثُمَّ قَالَ «صَلُّوا فِيمَا بَيْنَ أَنْ يَغِيبَ الشَّفَقُ إِلَى ثُلُثِ اللَّيْلِ»