Charles Spurgeon Commentary Hebrews 13:15

"Through him then let us offer up a sacrifice of praise to God continually, that is, the fruit of lips which make confession to his name." — Hebrews 13:15 (ASV)

By him therefore let us offer the sacrifice of praise to God continually, that is, the fruit of our lips giving thanks to his name.

If you are believers in Christ, you are God's priests, and this is the sacrifice that you are to offer continually – the fruit of your lips, giving thanks to God's name.