Sayyiduna Abu Hurayrah (may Allah be pleased with him) says that the Messenger of Allah (peace and blessings be upon him) said: "If people knew how much reward there is in the call to prayer (adhan) and the first row, they would draw lots for it. If they knew the reward of coming early at midday, they would race one another to it. If they knew the reward of the Isha and Fajr prayers, they would come to them even if crawling on their knees."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب العتق / 21409