Abu Hurairah (may Allah be pleased with him) reports that the Messenger of Allah (peace be upon him) said: "If people were to know the reward for giving the adhan and for (praying in) the first row, they would draw lots for it."
Hadith Referenceصحيح ابن خزيمه / جماع أبواب قيام المأمومين خلف الإمام وما فيه من السنن / 1554