Oaths and Vows

Bukhari :: Book 8 :: Volume 78 :: Hadith 645

Narrated Abu Huraira:

The Prophet said, "Whoever swears saying in his oath. 'By Al-Lat and Al'Uzza,' should say, 'None has the right to be worshipped but Allah; and whoever says to his friend, 'Come, let me gamble with you,' should give something in charity."