Maaseh Rav Siman 109
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מצוה לרחוץ כל גופו בע"ש ועכ"פ לא פחות מפניו ידיו ורגליו:
Sefaria Community Translation
It is a Mitzva to wash ones whole body before Shabbat, and certainly not less than one’s face, hands, and legs.