The Book of Oaths (Kitab Al-Aiman)
Muslim :: Book 15 : Hadith 4041
Abu Huraira reported Allah's Messenger (may peace be upon him) as saying: He who takes an oath in the course of which he says: By Lat (and al-'Uzza), he should say: There is no god but Allah; and that it anyone says to his friend:" Come and I will gamble with you," he should pay sadaqa.
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