'Observed' in the Bible
They observed the Festival of Temporary Shelters as required and offered the proper number of daily burnt offerings according to the requirement for each day.
The people of Israel -- the priests, the Levites, and the rest of the exiles -- observed the dedication of this temple of God with joy.
The exiles observed the Passover on the fourteenth day of the first month.
They observed the Feast of Unleavened Bread for seven days with joy, for the Lord had given them joy and had changed the opinion of the king of Assyria toward them, so that he assisted them in the work on the temple of God, the God of Israel.
I had them assemble at the canal that flows toward Ahava, and we camped there for three days. I observed that the people and the priests were present, but I found no Levites there.