It is recommended to delay isha prayer until the first third of the night or until almost midnight. That is the best time to perform isha prayer.
In a hadith from Anas ibn Malik (may Allah blesses him), he says:
أنهم انتظروا النبي صلى الله عليه وسلم ، فجاءهم قريبًا من شطر الليل فصلى بهم، يعني العشاء، قال: ثم خطبنا فقال: “ألا إن الناس قد صلوا. ثم رقدوا، وإنكم لن تزالوا في صلاة ما انتظرتم الصلاة
Once the Prophet (ﷺ) delayed the ‘Isha’ (night) prayer till almost midnight. He (ﷺ) turned to us after the prayer and said, “All the people slept after offering their prayers, but you who waited, will be accounted as if you were engaged in your prayer throughout the period” [Saheeh al- Bukhari].
But to be noticed, all men must perform salah at the masjid with jama’ah. If the masjid perform isha early in time, so all men must perform isha at that time at the masjid.
If someone have something that make him should perform isha prayer at the house, so he can delay isha prayer based on the explanation above.
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