'Whom' in the Bible

I constantly thank my God whom I serve with a clear conscience, as my ancestors did when I remember you in my prayers night and day,

That is why I suffer as I do. However, I am not ashamed, for I know the one in whom I have put my trust, and I'm convinced that he is able to protect what he has entrusted to me until the day that he comes.

But as for you, continue in what you have learned and found to be true, because you know from whom you learned it.