Musnad Ahmad 30:849

Muhammad—meaning Ibn Ja'far—and Hashim narrated to us, they said: Shu'bah narrated to us. Hashim said: Yahya ibn Abi Sulaym informed me, I heard 'Amr ibn Maymun. And Muhammad said: From Abu Balj, from 'Amr ibn Maymun, from Abu Hurayrah, from the Prophet, peace and blessings of Allah be upon him, that he said: "Whoever loves—and Hashim said: Whoever is pleased—to find the taste of faith, then let him love a person; he does not love him except for Allah, the Mighty and Majestic."