How do we know that God's salvation is a significant theme in the Bible?

The theme of God's salvation is undeniably woven throughout Scripture, highlighted prominently in the song of Moses found in Exodus 15. This song emphasizes that the salvation of the Israelites was solely the work of Jehovah, as they sang about what God had done for them, not what they had done for Him. As stated in Exodus 15:2, 'The Lord is my strength and song, and He has become my salvation.' This acknowledgment of God as the source of salvation is echoed throughout the Old Testament and firmly established in the New Testament, particularly in the sacrificial work of Christ, who redeems sinners from their sins. The repeated refrain in both Testaments that 'salvation belongs to the Lord' underscores its significance. God's distinguishing grace in salvation, illustrated in the contrast between the Israelites and the Egyptians, reflects His sovereign choice and unmerited favor toward those He saves.