´Abu Hurairah narrated that :` Allah's Messenger said: "If it were not that it would be a hardship on my Ummah, then I would have ordered you to delay Isha until the third of the night, or its half."
Hadith Referenceسنن ترمذي / كتاب الصلاة / 167
Hadith Gradingالألبانی:صحيح، ابن ماجة (691)
Hadith Takhrij«سنن ابن ماجہ/الصلاة 8 (690) ، ( تحفة الأشراف : 12988) ، مسند احمد (2/245) (صحیح)»