Musnad Ahmad 435:47

Rawh narrated to us, he said: Hammad ibn Salamah narrated to us, from Jabalah ibn Atiyyah, from Ibn Muhayriz, from Mu'awiyah, from the Prophet, may Allah bless him and grant him peace, who said: "If Allah, the Almighty and Majestic, intends good for a servant, He grants him understanding of the religion."