What was the sin of Sodom?

The first reading for Sunday, July 28, 2013 (the 17th Sunday in ordinary time) is from the Book of Genesis, chapter 18, verses 20-32. It is part of the whole story of Sodom and Gommorah, which fills most of chapters 18 and 19. Both the Old and the New Testaments come back to the theme of "the sin of Sodom" many times, for example in:

• Wisdom 19:13-17
• Isaiah 1:10-17
• Jeremiah 23:9-14
• Ezekiel 16:48-50
• Matthew 10:5-15

Fr. Bob based his Sunday sermon on this theme. So, just to see how much you know - or think you know - about the Bible, here is a quick quiz with just one question. This is meant as a little learning experience, not a serious exam. Fr. Bob will reveal his answer here on August 7.