When considering the ethical texts in the Bible, one does not normally think of the Psalms. But Gordon Wenham does a nice job of bringing out the ethical elements in the book. One way he does this is by showing that parts of the psalms deal with each "command" of the Decalogue. There are too many texts to deal with here but check out Wenham's discussion if you are interested
Gordon Wenham, The Psalter Reclaimed: Praying and Praising with the Psalms (Wheaton, IL: Crossway, 2013), 107-115.