In Hebrews 13:2 the Bible tells us not to be forgetful to entertain strangers for thereby some have entertained angels unaware. As said earlier Abraham was always looking for opportunities to be blessed. He knew the secrets, he obeyed God, allowed others first before him and above all he saw God in every situation.
That was what happened in Genesis 18. During the heat of one of those days, Abraham sat at the tent door. All of a sudden he saw three men. Without losing a moment he swung into action by making them to feel at home.
He ran to meet them. He bowed himself to the ground and said, "Let a little water be fetched and wash your feet and rest yourself under the tree. And I will fetch a morsel of bread and comfort ye your hearts after that ye shall pass on."
Active Christians should know that the story didn't end there: "Abraham then hastened into the tent unto Sarah and said, Make ready quickly three measures of fine meal, knead it and make cakes upon the hearth. And Abraham ran unto the herd and fetched a calf tender and good and gave it unto a young man he hastened to dress it. And he took butter, and milk and calf which he had dressed and set it before them and he stood by them under the tree and they did heat." (Genesis 18: 4-8).
It was shortly afterward that God promised to bless Abraham with a son. Their had time come. The long awaited promise was soon to be fulfilled. It was at that moment that God revealed to Abraham what he was set to do with Sodom and Gomorrah. This was what made Lot and her daughters to be saved.
All about life is giving and sharing. The two greatest commandments summarize it: Love God and love others. Jesus our great teacher said it was better to do good to those that will not repay you. Here is where the greater blessing is found in the Christian world.