Targum for Exodus 30:21

וְרָחֲצ֛וּ יְדֵיהֶ֥ם וְרַגְלֵיהֶ֖ם וְלֹ֣א יָמֻ֑תוּ וְהָיְתָ֨ה לָהֶ֧ם חָק־עוֹלָ֛ם ל֥וֹ וּלְזַרְע֖וֹ לְדֹרֹתָֽם׃ (פ)

so they shall wash their hands and their feet, that they die not; and it shall be a statute for ever to them, even to him and to his seed throughout their generations.’

Targum Jonathan on Exodus