How do we know the doctrine of commitment is true?

The narrative of the early church in Acts shows that true commitment is evidenced by selflessness and unity among believers. The contrast between Barnabas, who freely gave from a heart of commitment, and Ananias and Sapphira, who attempted to deceive by retaining part of their gain, underscores the biblical teaching that God looks not just at actions, but at the heart. Peter pointed out the seriousness of their deceit, teaching us that God expects a commitment that arises from a sincere love for Christ and His mission. This principle permeates Scripture, as seen in 2 Corinthians 9 where Paul instructs believers to give cheerfully out of the grace God has bestowed upon them.