How do we know God is jealous for His glory?

God's jealousy is rooted in His inherent perfection and holiness; He demands worship that reflects His true character. As stated in Exodus 20:5, God is described as a 'jealous God', emphasizing that He does not share His glory with any other entity or representation that is not true to His being. This jealousy underscores the seriousness of idolatry; when mankind attempts to create an image of God, it not only misrepresents Him but also diminishes His inherent worth. Thus, God's jealousy is fundamentally about His glory, which is due from all creation, and anything else is a distortion of the truth about who He is.