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(975)
Imam Sadeq (PBUH) says
When you fast, your eyes, ears and hair and skin should be fasting (that is, avoid sins).
Kafi (T-Islamiyyah) c. 4, p. 87, h. 1
I La Yazrah al -Fiqhiyyah V2, p. 108, h 1855
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NOTE: Translated with Google Translate