Musnad Abu Ya'la al-Mawsili 243:73

On the authority of Abu Musa, he said: The Messenger of Allah (ﷺ) said: "Indeed, the people with the greatest reward in prayer are those who walk the furthest distance to it, then the next furthest. And the one who waits for the prayer until he performs it with the Imam in congregation has a greater reward than the one who performs it and then sleeps."