How does the Holy Spirit validate preaching?

According to Hebrews 2:3-4, the message of salvation was confirmed by signs, wonders, and various miracles, authenticating the preachers of the gospel. This validation is seen at Pentecost when the Spirit empowered the apostles to speak in different languages, illustrating divine authority and purpose. For preachers today, the legitimacy of their message is measured against the content of the gospel itself—whether it aligns with the grace and truth of Christ. Authentic preaching, therefore, is marked by the Spirit's presence and the faithful proclamation of the biblical message.