Bible Verses About Feast of Tabernacles: Penalty for not observing

Then all the survivors from the nations that came against Jerusalem will go up year after year to worship the King, the LORD of Hosts, and to celebrate the Feast of Tabernacles.

And should any of the families of the earth not go up to Jerusalem to worship the King, the LORD of Hosts, then the rain will not fall on them.

And if the people of Egypt will not go up and enter in, then the rain will not fall on them; this will be the plague with which the LORD strikes the nations who do not go up to celebrate the Feast of Tabernacles.

This will be the punishment of Egypt and of all the nations that do not go up to celebrate the Feast of Tabernacles.