Al-Zuhri says that Urwah bin al-Zubayr informed me that Sayyidah Aishah (may Allah be pleased with her) said: The Messenger of Allah (peace and blessings be upon him) delayed the Isha prayer into the darkness, until Sayyiduna Umar (may Allah be pleased with him) called out: "The prayer! The children and women have fallen asleep." The Messenger of Allah (peace and blessings be upon him) came out and said: "No one among the people of the earth is waiting for it except you." In those days this prayer was prayed only in Madinah, and they used to pray Isha between the setting of the redness of the night and a third of the night.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 1752