a statute: a binding rule that has been laid down and set in force, whether by God or by a human authority.
At its core this word names something that has been settled and put on the books. The root behind it means to cut into, to carve, or to engrave, so the picture is of a rule that has been incised and made permanent, not advice or a custom that grew up on its own. It is something an authority has fixed in place, so that it now stands and must be kept. That is why it so often travels alongside other words for law and judgment: it is one of Israel's standard terms for an item of binding legislation.
Most of the time the authority behind the statute is God. In Deuteronomy and Psalm 119 especially, the word piles up with commandment (מִצְוָה), law (תּוֹרָה), and ruling (מִשְׁפָּט) to describe the whole body of what the LORD has decreed for his people to live by. Keeping his statutes is the mark of loyalty to him; abandoning them is the charge the prophets bring against Israel.
The same word also covers rules set by people. A king, a leader, or a community can establish a statute that then governs how things are done, and once set it carries the same fixed, must-be-obeyed force. So the line between God's statutes and human ones is not in the word itself but in who issued the rule.