It is narrated from Sayyiduna Ibn Abbas (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) delayed the Isha prayer one night so much that the people fell asleep; then they woke up, and Sayyiduna Umar (may Allah be pleased with him) came and said: "O Messenger of Allah! The prayer."
So he (peace and blessings be upon him) came out and led them in prayer, and (the narrator) did not mention that they performed ablution.
No one narrated this hadith from Yunus (may Allah have mercy on him) except Hammad (may Allah have mercy on him), and Yunus bin Muhammad al-Mu'addib (may Allah have mercy on him) and Ibn Aishah (may Allah have mercy on him) are alone in narrating it from him.
Hadith Referenceالمعجم الأوسط / باب الألف / 577
Hadith Takhrij«أخرجه أحمد فى «مسنده» برقم: 2230، وعبد بن حميد فى «مسنده» برقم: 634، والطحاوي فى «شرح مشكل الآثار» برقم: 3442، والطبراني فى «الكبير» برقم: 11346، 11345»