Musnad Ahmad 30:968

'Abd al-Razzaq narrated to us, Ma'mar narrated to us, from al-Zuhri, from Humayd ibn 'Abd al-Rahman, from Abu Hurayrah, who said: The Messenger of Allah (may Allah bless him and grant him peace) said: "Whoever swears an oath and says in his oath: 'By al-Lat,' then let him say: 'There is no god but Allah.' And whoever says to his companion: 'Come, let us gamble,' then let him give something in charity."