'Observed' in the Bible

He observed the daily requirements for sacrifices that Moses had specified for Sabbaths, new moon festivals, and the three annual celebrations -- the Feast of Unleavened Bread, the Feast of Weeks, and the Feast of Temporary Shelters.

So they sent an edict throughout Israel from Beer Sheba to Dan, summoning the people to come and observe a Passover for the Lord God of Israel in Jerusalem, for they had not observed it on a nationwide scale as prescribed in the law.

The Israelites who were in Jerusalem observed the Feast of Unleavened Bread for seven days with great joy. The Levites and priests were praising the Lord every day with all their might.

Josiah observed a Passover festival for the Lord in Jerusalem. They slaughtered the Passover lambs on the fourteenth day of the first month.

So all the preparations for the Lord's service were made that day, as the Passover was observed and the burnt sacrifices were offered on the altar of the Lord, as prescribed by King Josiah.

So the Israelites who were present observed the Passover at that time, as well as the Feast of Unleavened Bread for seven days.

A Passover like this had not been observed in Israel since the days of Samuel the prophet. None of the kings of Israel had observed a Passover like the one celebrated by Josiah, the priests, the Levites, all the people of Judah and Israel who were there, and the residents of Jerusalem.

This Passover was observed in the eighteenth year of Josiah's reign.