10 You must act according to the decisions they give you at the place the LORD will choose. Be careful to do everything they instruct you to do.

Read Deuteronomy 17:10 Using Other Translations

And thou shalt do according to the sentence, which they of that place which the LORD shall choose shall shew thee; and thou shalt observe to do according to all that they inform thee:
Then you shall do according to what they declare to you from that place that the LORD will choose. And you shall be careful to do according to all that they direct you.
You must carry out the verdict they announce and the sentence they prescribe at the place the LORD chooses. You must do exactly what they say.