# holy brothers

"holy brothers and sisters" or "my holy fellow believers" 

# you share in a heavenly calling

"God has called us together" 

# the apostle and high priest

Here the word "apostle" means someone who has been sent. In this passage, it does not refer to any of the twelve apostles. Alternate translation: "the one whom God sent and is the high priest"

# of our confession

"whom we confess" or "in whom we believe"