Shemot 30:19

את ידיהם ואת רגליהם THEIR HANDS AND THEIR FEET The priest washed his hands and his feet simultaneously. Thus we learn in Zevachim 19b: How was the procedure in washing hands and feet? He placed his right hand upon his right foot (knee) and his left hand upon his left foot (knee) and thus washed both simultaneously.

וְרָחֲצ֛וּ אַהֲרֹ֥ן וּבָנָ֖יו מִמֶּ֑נּוּ אֶת־יְדֵיהֶ֖ם וְאֶת־רַגְלֵיהֶֽם׃

For Aharon and his sons shall wash their hands and their feet thereat: