What does Isaiah 1:13 mean?
Israel's problem during this time was not a lack of religiosity. They were obeying the Lord's commands about participating in the sacrificial system. As well, they burned incense during offerings, observed the required celebrations, and participated in other local and national gatherings of God's people. The problem was that they were doing all these things while continuing in obvious sinful practices.Without soft hearts and right actions, God called their offerings vain and their incense abominable. He says He cannot endure their sinfulness as they all gather for solemn assemblies as if they are righteous. Their gatherings amount to no more than playacting instead of representing the true nature of their hearts before God. The New Testament refers to this using a Greek term for an actor—hypokrites—which we express in English as "hypocrisy" (Matthew 6:5; 7:5; 23:15).