What does the Bible say about how God spoke to His people?

Hebrews 1:1-2 explains that in various ways, including through prophets, God communicated His message throughout history, but in the last days, He has chosen to reveal Himself directly through His Son. This signifies a pivotal moment where God's ultimate revelation of His character and will is found in Jesus Christ, who embodies God's message. Prophets were flawed human messengers, yet Christ is the perfect and divine messenger who came to fulfill the promises made by God through them.