Parshat Vayeira - Beresheit Chapter 18 - Verses 5 - 7.
In verse 5 Avraham is saying to his guests Avraham is saying I will bring you some bread and I will nourish your hearts & then after I take care of your needs then you can go on your way, but now you are mine. Serving is an honor for Avraham.
In verses 6 & 7 we see Avraham at what he does best. He is showing us the midos of Zrizus (alacrity/zealousness).