What heart attitude should the Hebrews express during this feast?
Leviticus 23:40 (ESV)
40And you shall take on the first day the fruit of splendid trees, branches of palm trees and boughs of leafy trees and willows of the brook, and you shall rejoice before the LORD your God seven days.
The Feast of Booths was to be an occasion of great celebration and rejoicing. This feast is the only festival within the Hebrew calendar in which the Israelites are commanded to rejoice.
40 And you shall take on the first day the fruit of splendid trees, branches of palm trees and boughs of leafy trees and willows of the brook, and you shall rejoice before the LORD your God seven days.