Exodus 18: Jethro

Jethro was delighted to hear about all the good things the LORD had done for Israel in rescuing them from the hand of the Egyptians. 
He said, “Praise be to the LORD, who rescued you from the hand of the Egyptians and of Pharaoh, and who rescued the people from the hand of the Egyptians. 
Now I know that the LORD is greater than all other gods, for he did this to those who had treated Israel arrogantly.” 
Then Jethro, Moses’ father–in–law, brought a burnt offering and other sacrifices to God, and Aaron came with all the elders of Israel to eat bread with Moses’ father–in–law in the presence of God. - Exodus 18:9-12 NIV

Throughout the Bible, God uses people who are not of his chosen people to bring his word to those very people.  Jethro was one of them.  He was not a descendent of Abraham, but he recognized the hand of God in rescuing the Israelites from the Egyptians.  Not only did Jethro recognize God's work, but he brought God's wisdom to Moses.  Moses was trying to do all of the work himself and it was impossible.  He had to rely on others to hold his hands up because they tired of all the work.  Jethro was God's mouthpiece to deliver a better way of dealing with the vast number of people and issues.  Sometimes we need to listen to those who may not be of our own spiritual family in order to hear God's word and his wisdom.