Murillo, Abraham and the Three Angels
Oil on canvas, 93 x 102¾ in. (236 x 261 cm.)
National Gallery of Canada
The title accepts the idea that the three are angels, as they have often been pictured. But Genesis 18:2 says only that Abraham lifted his eyes and saw "three men." In any case, in verses 10-15 the men, plural, disappear from the narrative and it is "the Lord" who addresses Abraham and Sarah in the first person singular. The traditional Christian interpretation of all this is that God manifested himself to Abraham as the Trinity.
Read more about Abraham and about the Trinity in Christian art.