'Observe' in the Bible

Then shalt thou prosper, if thou observe to do the statutes and the ordinances which Jehovah charged Moses with concerning Israel: be strong, and of good courage; fear not, neither be dismayed.

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