As per being under taqleed of Ayatollah Sistani, while performing wuzu and wiping the feet, is it compulsory to wipe till the ankle(joint) ? If yes, then.. Are there any other Marja who says it is not compulsory?

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Yes according to Ayatollah Sistani and all the other maraje it must be up to the ankle joint as the verse of Quran states (Surah 5 verse 6)