Luther on Genesis 9:

In the first place, Noah filled the office of bishop; and because he had been plagued by various temptations, it was his foremost concern to oppose the devil and comfort the tempted, to restore the erring, to give confidence to the wavering, to encourage the despairing, to shut out the impenitent from his church, and to receive back the penitent with fatherly joy. These are almost the same duties that must be performed by a bishop through the ministry of the Word.