It is narrated from Sayyiduna Abu Hurayrah (may Allah be pleased with him) that he (peace and blessings be upon him) said: "Were it not that I would be placing hardship on my Ummah", I think he (peace and blessings be upon him) said, "I would have commanded them to use the miswak with every ablution, and to delay the Isha prayer until a third of the night or half of the night."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الطهارة / 149