John Gill Commentary Nehemiah 9:13

"Thou camest down also upon mount Sinai, and spakest with them from heaven, and gavest them right ordinances and true laws, good statutes and commandments," — Nehemiah 9:13 (ASV)

You came down also upon Mount Sinai
By some visible tokens of his presence, as a cloud, fire, smoke which must be understood consistent with his omniscience, see (Exodus 19:18) ,

and spoke with them from heaven ;
the decalogue or ten commandments, (Exodus 20:1–17) ,

and gave them right judgments and true laws, good statutes and
commandments ;
both judicial and ceremonial, which were of excellent use to them in their civil and ecclesiastical polity; these were not spoken to Israel, but given to Moses on the mount, to be delivered to them.