Musannaf Ibn Abi Shayba 23:129

Abu Mu’awiyah narrated to us, from al-A’mash, from Abu Salih, from Abdullah ibn Damrah, from Ka’b, who said: "Whoever establishes the prayer, gives the zakat, and hears and obeys, has reached the middle of faith. And whoever loves for the sake of Allah, hates for the sake of Allah, gives for the sake of Allah, and withholds for the sake of Allah, has perfected faith."