en_tn_condensed/deu/30/19.md

I call heaven and earth to witness

Possible meanings are 1) Moses is calling on all those who live in heaven and earth to be witnesses to what he says, or 2) Moses is speaking to heaven and earth as if they are people, and he is calling them to be witnesses to what he says

to witness against you

"to be willing to say that you have done evil things"

against you today

Moses speaks to the Israelites as a group.