It is narrated from Sayyiduna Abu Hurayrah and Sayyiduna Ibn Abbas (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) said: "Spending one morning or one evening in the path of Allah is better than the world and everything in it."
Hadith Referenceمسند أبي يعلى الموصلي / أول مسند ابن عباس / 2506