'Observe' in the Bible

Then you will prosper, if you observe to do the statutes and the ordinances which Yahweh gave Moses concerning Israel. Be strong, and courageous. Don't be afraid, neither be dismayed.

Now therefore, in the sight of all Israel, the assembly of Yahweh, and in the audience of our God, observe and seek out all the commandments of Yahweh your God; that you may possess this good land, and leave it for an inheritance to your children after you forever.