'Observe' in the Bible

Now observe how great this man was to whom Abraham, the patriarch, gave a tenth of the choicest spoils.

Keep your behavior excellent among the Gentiles, so that in the thing in which they slander you as evildoers, they may because of your good deeds, as they observe them, glorify God in the day of visitation.

as they observe your chaste and respectful behavior.

By this we know that we love the children of God, when we love God and observe His commandments.