The Old Testament concludes with God's promise that one day the Day of the Lord would arrive and deliver his world from Babylon
and it would be done through a promised royal priest who would suffer like a slave and die for the sin of all humanity but then exalted
as King over the nations. Jewish people continue to await the Messiah, but for Christians, this "Day of the Lord" has already arrived,
Who is it?

As early as the second century, this treatise, which is of great rhetorical power and force in its admonition to faithful pilgrimage under Christ’s leadership, bore the title “To the Hebrews.” It was assumed to be directed to Jewish Christians. Usually Hebrews was attached in Greek manuscripts to the collection of letters by Paul. Although no author is mentioned (for there is no address), a reference to Timothy (Heb 13:23) suggested connections to the circle of Paul and his assistants. Yet the exact audience, the author, and even whether Hebrews is a letter have long been dispute

Explanation:

answer; clean work space and clothing using compressed air;