What does Psalm 34:3 mean?

In this verse David appeals to his men or the congregation of Israel to join him in praising God and exalting His name.

The Bible places a high value on believers joining over matters of truth and goodness (Psalm 133:1; John 17:20–23; Ephesians 4:1–6; Philippians 2:1–11; 1 Corinthians 1:10–17). Acts 2:42–47 describes the togetherness of the believers at Jerusalem as they bonded together to form the earliest congregations of the Christian church. They shared their goods and money. They attended the temple together. They broke bread together, and they praised God together. When the Jewish council released Peter and John, the two apostles went to their friends and told them what the chief priests and elders had commanded them. Then, when their friends had heard it, "they lifted their voices together" and prayed (Acts 4:23–31).

Romans 12:15 calls upon Christians to "rejoice with those who rejoice." And Hebrews 10:24 tells us to "consider how to stir up one another to love and good works." Verse 25 instructs us to encourage one another.