A vow in Hebrew culture was a solemn promise made in the midst of crisis — 'God, if you save me, I will...' Now the rescue has come, and the psalmist publicly honours his vow. Gratitude expressed publicly strengthens faith in the whole community.
Memory phrase: My rescue leads to public praise.
Talk about it: Have you ever promised God something? What happened?
Prayer: God, when You answer my prayers, help me tell others and give You the credit loudly.