Is it disliked to wear a ring on the thumb, and what is the reason for that?
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Question:
May Allah reward you, Honorable Shaykh. This questioner says: Is it disliked to wear a ring on the thumb? And what is the reason for that?
Answer:
No, it is not customary to do this. One wears it on the finger that is customary, which is the ring finger or the middle finger, and on the left hand. This is what is customary, and custom is considered. Yes.
May Allah reward you, Honorable Shaykh. This questioner says: Is it disliked to wear a ring on the thumb? And what is the reason for that?
Answer:
No, it is not customary to do this. One wears it on the finger that is customary, which is the ring finger or the middle finger, and on the left hand. This is what is customary, and custom is considered. Yes.
Source
قناة «العلامة الدكتور صالح الفوزان»، [844 -954] هل يكره لبس الخاتم في الإبهام، وما هي العلة في ذلك؟ - الشيخ صالح الفوزان — youtube.com
The Arabic text is a machine transcription of the audio recording.