'Observe' in the Bible

They shall observe his duties and the duties of the entire community before the tent of assembly, to do the work of the tabernacle.

So you shall appoint Aaron and his sons, and they shall observe and attend to their priesthood; but the layman (non-Levite) who approaches [the holy things] shall be put to death.”

“The Israelites are to observe the Passover at its appointed time.

You must observe it at its appointed time on the fourteenth day of this month at twilight; you are to observe it according to all its statutes and ordinances.”

So Moses told the Israelites to observe the Passover,

But there were some men who were unclean because of a human corpse, so they could not observe the Passover on that day. These men came before Moses and Aaron the same day

“Tell the Israelites: When any one of you or your descendants is unclean because of a corpse or is on a distant journey, he may still observe the Passover to the Lord.

Such people are to observe it in the second month, on the fourteenth day at twilight. They are to eat the animal with unleavened bread and bitter herbs;

they may not leave any of it until morning or break any of its bones. They must observe the Passover according to all its statutes.

“But the man who is ceremonially clean, is not on a journey, and yet fails to observe the Passover is to be cut off from his people, because he did not present the Lord’s offering at its appointed time. That man will bear the consequences of his sin.

“If a foreigner resides with you and wants to observe the Passover to the Lord, he is to do so according to the Passover statute and its ordinances. You are to apply the same statute to both the foreign resident and the native of the land.”

See what the land is like. Observe whether the people who live there are strong or weak, or whether they're few or numerous.

"Here's what you are to do when you all go astray and fail to observe all these commands that the LORD had spoken to Moses,

That way, when you see the tassel, you'll remember all the commands of the LORD and you'll observe them. Then you won't seek your own interests and desires that lead you to be unfaithful.

Therefore, remember to observe all my commands and to be holy in the presence of your God.

Balak said to him, "Please come with me to another place from which you can observe them. You will see only a part of them, but you will not see all of them. Curse them for me from there."

I can see him, but not right now. I observe him, but from a distance. A star streams forth from Jacob; a scepter arises from Israel. He will crush Moab's forehead, along with all of Seth's descendants.

Command the children of Israel, and say unto them, My offering, and my bread for my sacrifices made by fire, for a sweet savour unto me, shall ye observe to offer unto me in their due season.

‘Then on the fifteenth day of the seventh month you shall have a holy convocation; you shall do no laborious work, and you shall observe a feast to the Lord for seven days.