Sayyiduna Ibn Abbas (may Allah be pleased with them both) said: One night the Messenger of Allah (peace and blessings be upon him) delayed the Isha prayer, then came out with water dripping from his (peace and blessings be upon him) head, and said: "Were it not that I fear hardship for my Ummah, I would have liked this prayer to be prayed at this time."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 11342