What was the special mission of John the Baptist?

Answer

"There was a man sent from God, whose name was John. The same came for a witness, to bear witness of
the Light, that all men through him might believe." John 1: 6, 7.

While at the high priest's house, how did Peter deny Him?
When did the priest minister in the first apartment of the sanctuary?
What will occur when the Lord descends from heaven?
Is it the duty of gospel ministers to execute vengeance?
Did Christ keep the Sabbath?
What was the character and the work of many of the bishops at that time?
How is the closing period of tribulation of the church during this time referred to?

Questions & Answers are from the book Bible Readings for the Home Circle