This majestic painting was created for a large iconostasis, a screen separating the altar sanctuary from the nave in Orthodox churches. Here, Abraham and Sarah sacrifice a calf to honor their guests, who reveal themselves as angels (Genesis 18:1-10). Christian theologians interpreted the three angels as Old Testament precursors of the Father, Son, and Holy Spirit, so the icon is inscribed "The Holy Trinity". The meal that the angels bless mirrors the sacrament of the Lord's Supper celebrated behind the iconostasis during the Divine Liturgy. source
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This image is in the public domain.