'Observed' in the Bible

So Solomon and all Israel with him—a very great assembly, from the entrance to Hamath to the Brook of Egypt—observed the festival at that time for seven days.

On the eighth day they held a solemn assembly, for the dedication of the altar they observed seven days and the feast seven days.

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.

When the queen of Sheba observed Solomon’s wisdom, the palace he had built,

When the LORD observed that they had humbled themselves, the LORD spoke to Shemaiah, "They have humbled themselves, so I won't destroy them. Instead, I'll grant them some deliverance by not pouring out my indignation on Jerusalem, using Shishak to do it.

So when the chariot commanders observed Jehoshaphat, they said by mistake, "It's the king of Israel!" and they turned aside to attack him. But Jehoshaphat cried out to the LORD, who helped him, and God diverted them from him.

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.

The Israelites who were present in Jerusalem observed the Festival of Unleavened Bread seven days with great joy, and the Levites and the priests praised the Lord day after day with loud instruments.

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

And he caused his children to pass through the fire in the valley of the son of Hinnom: also he observed times, and used enchantments, and used witchcraft, and dealt with a familiar spirit, and with wizards: he wrought much evil in the sight of the LORD, to provoke him to anger.

“Go, inquire of the Lord for me and for those who are left in Israel and in Judah, concerning the words of the book which has been found; for great is the wrath of the Lord which is poured out on us because our fathers have not observed the word of the Lord, to do according to all that is written in this book.”

Josiah observed the Lord’s Passover and 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.

The Israelites who were present in Judah also observed the Passover at that time and the Festival of Unleavened Bread for seven days.

No Passover had been observed like it in Israel since the days of Samuel the prophet. None of the kings of Israel ever observed a Passover like the one that Josiah observed with the priests, the Levites, all Judah, the Israelites who were present in Judah, and the inhabitants of Jerusalem.

In the eighteenth year of Josiah’s reign, this Passover was observed.