Musannaf Ibn Abi Shayba 21:342

Sharik narrated to us, from Yahya ibn Sa'id, from Sa'id ibn al-Musayyib, who said: Mu'adh ibn Jabal said: "If there were two men, one of them charging on high-quality horses in the way of Allah, and the other remembering Allah, the one remembering Allah would be better or greater in reward."