Abu Dawud Book 2, Hadith Number 580.

Narated By Uqbah ibn Amir : I heard the Apostle of Allah (PBUH) say: He who leads the people in prayer, and he does so at the right time, will receive, as well as those who are led (in prayer) will get (the reward). He who delays (prayer) from the appointed time will be responsible (for this delay) and not those who are led in prayer.