The Sacrifice of Melchizedek

5th century, with medieval and modern restorations
Mosaic
Nave, Basilica of Santa Maria Maggiore, Rome

See Genesis 14:14-20.

This is part of the extensive series of Old Testament scenes portrayed in mosaics along the two walls of the nave. Follow this link for links to the others.

This image in full resolution
More of Abraham

Photographed at the basilica by Richard Stracke, shared under Attribution-NonCommercial-ShareAlike license.