'Observe' in the Bible

Then Hezekiah sent word throughout all Israel and Judah, and he also wrote letters to Ephraim and Manasseh to come to the Lord’s temple in Jerusalem to observe the Passover of Yahweh, the God of Israel.

For the king and his officials and the entire congregation in Jerusalem decided to observe the Passover of the Lord in the second month,

because they were not able to observe it at the appropriate time. Not enough of the priests had consecrated themselves and the people hadn’t been gathered together in Jerusalem.

so they affirmed the proposal and spread the message throughout all Israel, from Beer-sheba to Dan, to come to observe the Passover of Yahweh, the God of Israel in Jerusalem, for they hadn’t observed it often, as prescribed.

A very large assembly of people was gathered in Jerusalem to observe the Festival of Unleavened Bread in the second month.

The whole congregation decided to observe seven more days, so they observed seven days with joy,