Psalm 106:12 Then believed they his words; they sang his praise.
The response of God’s people after the Great Exodus Event was that they believed God’s words. God had said, “Stand still and see the salvation of the Lord.” Then the Lord parted the waters, the people passed through, and He drowned the Egyptian army. He saved them and they believed after they saw the salvation. God did a mighty act and they witnessed it with their own eyes. Then they believed. They witnessed God’s word and promise come true.
Our response to God’s saving Gospel of Christ is to believe His words when we hear it and see it. The Holy Spirit opens the eyes of faith to witness the death and resurrection of Jesus, even though we were not physically present. Jesus said to Thomas, “Blessed are those who have not seen and yet have believed.” The Spirit gives faith to see our salvation in Christ, and we are saved.
Then we respond to the gift of salvation by singing His praises. When we truly hear, see, receive, and believe the words of God it is natural to respond with songs of praise in the public assembly and in the mind daily. They responded with the “Song of Moses” in Exodus 15.