Many attribute the term silver-tongued to a description of a certain preacher who lived in England in the latter 1500s named Henry Smithe, also known as Silver Tongued Smith. However, there is a passage in the Old Testament of the Bible which may be the basis of this idiom.

What does it mean silver tongued devil?

I understand that "silver-tongued" or "silver-tongued devil" means to be a good orator, or: able to speak in a way that makes other people do or believe what you want them to do or believe Merriam Webster.

Who is silver tongued?

A silver-tongued person is very skillful at persuading people to believe what they say or to do what they want them to do.