Is there anything in the Bible about mediums?

Do you know whether there are any other revelations, which have been made through mediums in regard to the life and character of Jesus?

I do not know. Paul may have come back for such a purpose, but I rather think not, for he himself only knew of these things by hearsay. As regards the early part of the life of Jesus, very few in Judea knew anything about it—that part being spent principally in Egypt and Persia. On his return to Judea, his life was for a few years one of seclusion, for being the inhabitant of a small, obscure village or town, he would only be known to a few immediate friends. Subsequently, on his second visit to Persia, he began to attract public attention by the exercise of the great gifts with which he was endowed, as I have already mentioned. But coming out as a public teacher in his own land, his sayings and doings. for the three years of his ministry, had all to be recorded—though it must be confessed, you have but a meagre summary of the whole. 

The Jews if they chose could give you much more than you have already got in what you call the gospels.

—Hafed, Prince of Persia