What does Psalm 50:8 mean?

It is possible to do some things in the right form and at the right time, yet still sin while doing so. The intent of one's heart is even more important than following the letter of the law. God has come to pronounce judgment on Israel (Psalm 50:1–6). He begins by noting that He will not rebuke them for failing to offer sacrifices—they are going through the motions of those rules.

The Lord had commanded the Israelites to offer various sacrifices to reflect their obedience to God's covenant (Exodus 29:38–42). The purpose of the sacrifices, however, was not merely to make smoke and forfeit resources. The sacrifices were also reminders of the nation's debt of gratitude towards the Lord, as well as their commitment to follow His words. When the people failed to obey God, yet still offered sacrifices regularly, it proved their misunderstanding (Hosea 6:6).