Hadith: Whoever swears by Al-Lāt and Al-‘Uzza (pagan idols) should say: there is no god but Allah. Whoever says to his companion "Come and gamble with me" should give charity

عن أبي هريرة رضي الله عنه مرفوعاً: «من حَلَفَ فقال في حَلِفِهِ: بِاللاَّتِ وَالْعُزَّى، فليقل: لا إله إلا الله، ومن قال لصاحبه: تعال أُقَامِرْكَ فَلْيَتَصَدَّقْ».
[صحيح] - [متفق عليه]

Abu Hurayrah (may Allah be pleased with him) reported that the Prophet (may Allah's peace and blessings be upon him) said: "Whoever swears by Al-Lāt and Al-‘Uzza should say: 'there is no god but Allah'. Whoever says to his companion 'Come and gamble with me’ should give charity."
[Authentic hadith] - [Narrated by Bukhari & Muslim]

Explanation

The Prophet (may Allah's peace and blessings be upon him) ordered the person who swears by other than Allah, such as swearing by the pagan idols Al-Lāt and Al-‘Uzza or other than them, to declare the Oneness of Allah by saying: "There is no god but Allah". Moreover, he ordered the person who says to his companion: "I bet you that this is such-and-such" to give charity.