God chose some people, the people of Israel, and He made them His children.  He told them He wanted them to bless others.  God loves orphans and other lonely and hurting people so much that He told the people of Israel to help them.
 
“When you are harvesting your crops and forget to bring in a bundle of grain from your field, don’t go back to get it.  Leave it for the foreigners, orphans, and widows.  Then the Lord your God will bless you in all you do.”  Deuteronomy 24:19 (NLT)
 
 “Give justice to the poor and the orphan; uphold the rights of the oppressed and the destitute.  Rescue the poor and helpless; deliver them from the grasp of evil people.”  Psalm 82:3-4 (NLT)