Read the books of Exodus, Deuteronomy and Leviticus where you will find your question answered in much detail. The priest would make intercession for the people, even the king, however there were specifics as to who that intercession was to be accomplished by the priests.
Because they are week minded.
I'm guessing 3 people praying on behalf of another.
disciples
About 1.7 million people visit the Twelve Apostles each year
There were several people, prophets and apostles who wrote books to make up the bible.
Church of the Intercession on the Nerl was created in 1165.
Church of the Intercession at Fili was created in 1694.
The people whom the apostles converted followed Christianity and so on and so on.
"Prayers of the faithful" is another name for prayers of intercession.
the apostles were filled with the spirit and spoke convincingly, and did a lot of healing and teaching as well.
Are current Pope and Bishops are the current sucessors of the apostles being they are the main people continuing on Jesus teachings