صحیح ابن حبان
Ibn Hibban
كتاب الصلاة
Book of Prayer
باب مواقيت الصلاة - ذكر العلة التي من أجلها كان لا يؤخر المصطفى صلى الله عليه وسلم صلاة العشاء على دائم الأوقات
Chapter on Prayer Times - The reason why the Prophet did not always delay the night prayer.
1 hadith
Hadith 1539
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."