Genesis 18:1 & 2

"The Lord appeared to Abraham near the great trees of Mamre while he was sitting at the entrance to his tent in the heat of the day. Abraham looked up and saw three men standing nearby. When he saw them, he hurried from the entrance of his tent to meet them and bowed low to the ground." NIV translation

In chapter 17, we saw Abraham and his family adopted as God's chosen people. Now, the Lord visits him and brings with Him two angels. We are reminded of the fact that, throughout the Bible, the number three is associated with the earthly display of God's will for man. 

Genesis 18:3 - 5

"He said, 'If I have found favor in your eyes lord, do not pass your servant by. Let a little water be brought, and then you may all wash your feet and rest under this tree. Let me get you something to eat, so you can be refreshed and then go on your way - now that you have come to your servant.' 'Very well,' they answered, 'do as you say.'" NIV translation

Abraham did not recognize Jesus or know that He had two angels with Him but he showed great hospitality to them anyway. Many of us would jump at the opportunity to serve Jesus in our home but are we so eager to serve regular men?

The Apostle Paul would recount this to the Jewish believers in reminding them that men can entertain angels without even being aware that they are angels (see Hebrews 13).

Genesis 18:6 - 8

"So Abraham hurried into the tent to Sarah. 'Quick,' he said, 'get three seahs of fine flour and knead it and bake some bread.' Then he ran to the herd and selected a choice, tender calf and gave it to a servant, who hurried to prepare it. He then brought some curds and milk and the calf that had been prepared, and set these before them. While they ate, he stood near them under a tree." NIV translation

When asked about the greatest commandment, Jesus said the second greatest was like the first and it was to love your neighbors as yourself. Abraham was demonstrating this as he prepared the best food that he had for his guests and expected nothing in return.