The most famous masterpiece by the genius medieval iconographer Andrei Rublev, created "in praise of Saint Sergius of Radonezh" at the request of his disciple, Abbot Nikon. The iconography stems from the Old Testament narrative of God appearing to the righteous Abraham in the form of three divine visitors near the oaks of Mamre (Genesis 18:1–15). Omitting the narrative and domestic details typical of the "Hospitality of Abraham" tradition, Rublev achieves unmatched symbolic depth. The focus is placed entirely on the silent Eucharistic communion of the three angels seated around an altar-like table. At the center lies a chalice containing the head of a sacrificed calf—a prefiguration of Christ as the Lamb of God (John 1:29). The left angel (God the Father) and the central angel (God the Son) bless the cup, signifying the Father's blessing for the Son's sacrificial death on the cross born of love for humanity (John 3:16). The right angel represents God the Holy Spirit, the Comforter (John 14:16, 26), who affirms the eternal power of forgiving love. The icon stands as a profound theological testament to the Triune God, spiritual unity, peace, and selfless sacrifice.