Therefore everyone who hears these words of mine and puts them into practice is like a wise man who built his house on the rock.
Matthew 7:24
The wonderful parable found in Matthew 7:24-27 is great to use with children, to help them understand the importance of honoring God by not sinning. Read this parable to them, or relay it in story-like fashion. We have a wonderful book by Candle Books called "The Two Builders" that we read to my boys (who, of course, love the idea of building things). It is a great way to help them understand in yet another way the importance of obedience and putting the Word of God (i.e. honor your mother & father, do not lie, treat others as you want to be treated) into action.