Ibn Sirin محمد بن سيرين الأنصاري · Oaths and Vows (Kitab Al-Aiman Wa Al-Nudhur)

The Messenger of Allah (ﷺ) as saying: If anyone swears on oath is the course which he says: "By al-Lat" he should say: There is no god but Allah, and that if anyone says to his friend: Come and let me play for money with you, he should give something in charity (sadaqah).