Psalms 35:18

I will give thee thanks in the great congregation: I will praise thee among much people.

The vow is to give thanks and sing praise to God publicly, in the great congregation and among many people. Those who seek God and find Him are to praise Him with the whole heart and thank Him openly for what He is doing, doing so together with the assembled congregation. The words express confidence that after deliverance this praise and thanks will be voiced publicly among God's people. That promise belongs to personal testimony, that it will be heard in the congregation of the saints. It is fulfilled in the hope of regaining speech in order to praise God before the congregation.