A Concordance is a type of reference book that has all of the words and phrases of the Bible listed in alphabetical order – as well as showing their corresponding book, chapter, and verse numbers each time they are mentioned. A concordance is useful study tool, especially when trying to look up a particular quotation or in researching a specific topic. For instance, if you wanted to find every reference to “incense” in the Bible or where the verse “A New Commandment I give to you, that you love one another as I have loved you” comes from, all you would need to do is look up the key words: incense, new, commandment, love, or one.