When Abraham lifted up his eyes
three men were standing opposite him;
and when he saw them,
he ran from the tent door to meet them and bowed himself to the earth,
and said, "My lord, if now,
please do not pass your servant by.
"Please let a little water be brought
and wash your feet,
and rest yourselves under the tree;…
[Genesis 18]
Rambam (Mimonides) Mishneh Torah
Webinar 24/04/2016