Matthew 15:11...
Did Jesus yet know about microbial pathogens? Evidently not. Historically, no one else yet did either. Though for that reason, as well as for ritual, hand-washing before eating turned out to be a very good idea.
“Hear, O Israel: The Lord our God, the Lord is One.” —Deuteronomy 6:4
Best....
Given that He is actually the Word of God, I’m guessing He knows everything.
:)