When is the last time God is thanked in the Bible?

It is in Revelation of John Chapter 11 around the time of the third Woe.

Source:

Revelation 11:17

In the book of Leviticus when must you eat the flesh of the animal offered as a sacrifice of thanksgiving?

No leftovers allowed you eat it on the same day. Just like the turkey we had Thursday.

Source:

Leviticus 22:29

For what thing did Paul tell the Thessalonians to give thanks?

Also Happy Thanksgiving to my American Readers.

Paul specifically told the Thessalonians to be thankful in everything.

Source:

1st Thessalonians 5:18

Jonah promised to sacrifice to the Lord with the voice of thanksgiving. Where was he when he promised this?

Jonah was praying in the belly of the fish.

Source:

Jonah 2:9

Paul was very thankful for the church at Philippi. How often did he thank God for them?

Paul thanked God for the church at Philippi every time he prayed for that church.

Source:

Philippians 1:3