Sayyiduna Abu Hurairah (may Allah be pleased with him) narrates this statement of the Prophet (peace and blessings be upon him): "If I did not fear hardship for my Ummah, I would have delayed the ‘Isha prayer until one third of the night (the narrator is in doubt, perhaps these are the words) or until half of the night."
Hadith Referenceصحیح ابن حبان / كتاب الصلاة / 1539
Hadith Gradingفضيلة الشيخ الإمام محمد ناصر الدين الألبانيصحيح - انظر ما قبله.فضيلة الشيخ العلّامة شُعيب الأرناؤوطإسناده صحيح على شرطهما، وهو مكرر ما قبله.