Then Joshua said to the people, "You are not able to serve the LORD, for he is a holy and jealous God. He will not forgive your rebellion and sins. (Joshua 24:19)(NLT)
When we speak of jealousy among human beings, we normally consider it a vice. However, the Bible clearly describes God--who is perfectly good--as jealous. How can a good God be jealous? The answer is that God's jealousy stems from his covenant love. He has specially chosen his people and loves them so much that he is jealous when they are unfaithful to him. Unlike human jealousy, God's jealousy is not selfish. God created us to enjoy his fellowship, and he knows that our unfaithfulness will only hurt us in the end. Meditate on the ways God's jealous love keeps us from disaster.
HOLY GOD, we praise you for your jealous love. Despite our unworthiness, you have chosen us as your people. Fill us with your Spirit so that we may serve you wholeheartedly. Help us to sever any loyalties that draw our attention away from you. Amen.
(from the Praise and Worship Study Bible--Tyndale House)