Musannaf Ibn Abi Shayba 33:545

Muhammad ibn Fudayl narrated to us, from Layth, from Mujahid, from Ibn Abbas, who said: Love for the sake of Allah, and ally for the sake of Allah, and show enmity for the sake of Allah. For indeed, the guardianship (wilayah) of Allah is only attained through that. A man will not find the taste of faith—even if his prayer and fasting are many—until he is like that.