What is the faith once delivered to the saints?

The 'faith once delivered to the saints' alludes to the body of doctrine entrusted to the apostles that remains unchanged over time. Jude 1:3 emphasizes the necessity of contending for this faith, indicating that it is a definite set of teachings rather than an evolving belief system. It underscores the church's responsibility to preserve and propagate these truths across generations. The doctrine includes the gospel message, the nature of God, and the requirements for salvation and church practices as defined by scripture.