Musannaf Ibn Abi Shayba 33:823

Waki' narrated to us, from Mis'ar, from Alqama bin Marthad, from Ibn Sabit, from Mu'adh, who said: "For me to remember Allah from the early morning until the sun rises is more beloved to me than for me to mount the swift horses in the way of Allah from the early morning until the sun rises."