'Feast' in the Bible

And they found written in the law which the LORD had commanded by Moses, that the children of Israel should dwell in booths in the feast of the seventh month:

Also day by day, from the first day unto the last day, he read in the book of the law of God. And they kept the feast seven days; and on the eighth day was a solemn assembly, according unto the manner.

And when the time came for the wall of Jerusalem to be made holy, they sent for the Levites out of all their places to come to Jerusalem, to keep the feast with joy, and with praise and melody, with brass and corded instruments of music.