If he has done you any wrong or owes you anything, charge it to my account.
I will pledge my own life, and you can hold me responsible for him. If I do not bring him back to you safe and sound, I will always bear the blame.
So, if you think of me as your partner, welcome him back just as you would welcome me.
Here, I will write this with my own hand: I, Paul, will pay you back. (I should not have to remind you, of course, that you owe your very self to me.)