Commentaries:
Symbolically, adultery is used to express unfaithfulness to God, and we can easily see this in Israel's idolatry. God is represented as the husband of His people. Ezekiel 16:15-59 gives a graphic description of Israel's spiritual adultery, and Hosea 1:1-2 shows the same symbolism in Hosea's marriage. We can fall into spiritual adultery by relying on the world and its false teaching rather than God.
Martin G. Collins
The Seventh Commandment