"The Messenger of Allah said: 'Were it not that it would be too difficult for my Ummah, I would have delayed the 'Isha' prayer until one third or one half of the night had passed.'" (Using translation from Ibn Mājah 691)
قَالَ رَسُولُ اللهِ ﷺ لَوْلَا أَنْ أَشُقَّ وَقَالَ مُحَمَّدٌ لَوْلَا أَنْ يُشَقَّ عَلَى أُمَّتِي لَأَخَّرْتُ صَلَاةَ الْعِشَاءِ إِلَى ثُلُثِ اللَّيْلِ وَلَأَمَرْتُهُمْ بِالسِّوَاكِ عِنْدَ كُلِّ صَلَاةٍ