Musnad Ahmad 482:77

Hammad ibn Khalid narrated to us, Mu'awiyah ibn Salih narrated to us, from Buhayr ibn Sa'd, from Khalid ibn Ma'dan, from Kathir ibn Murrah, from 'Uqbah ibn 'Amir, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "The one who recites the Quran aloud is like the one who gives charity aloud, and the one who recites the Quran secretly is like the one who gives charity secretly." Abu 'Abd al-Rahman said: My father said: "Hammad ibn Khalid was a memorizer, and he used to narrate to us while he was sewing. I and Yahya ibn Ma'in wrote from him."