Summary of passage: A seraph flew to Isaiah with a live coal, touched his lips, and removed his sin.
10a) A seraph touched Isaiah’s mouth with a live coal from the altar.
b) Personal question. My answer: that the coal had to be blessed by the Lord and the sin burned away.
11a) The reconciliation of God and man through the sacrificial death of Jesus Christ.
b) Jesus died for us and shed his blood. Isaiah had to have his flesh burned. Faith in God and Jesus’ bodily death saved us from sin. Isaiah had a huge faith and the seraph removed his sin through an Earthly deed. Only Jesus’ body and blood cleansed us forever so Isaiah had to shed blood as well (make a sacrifice) to be cleansed.
Conclusions: I struggled on this one and the other reference passages. I’m unsure if I grasped the connection.