A few days ago, we posted from Exodus 19:16-20 where Israel meets God. “There were thunders and lightnings and a thick cloud on the mountain and a very loud trumpet blast,” as well as smoke and flame as God descended. The day of Pentecost was at the same time of year, and similar things happened.
When the day of Pentecost arrived, they were all together in one place. And suddenly there came from heaven a sound like a mighty rushing wind, and it filled the entire house where they were sitting. And divided tongues as of fire appeared to them and rested on each one of them. And they were all filled with the Holy Spirit and began to speak in other tongues as the Spirit gave them utterance. (Acts 2:1–4, ESV)
The gospel was preached at Sinai, and it was preached again at Pentecost.
And how is it that we hear, each of us in his own native language? Parthians and Medes and Elamites and residents of Mesopotamia, Judea and Cappadocia, Pontus and Asia, Phrygia and Pamphylia, Egypt and the parts of Libya belonging to Cyrene, and visitors from Rome, both Jews and proselytes, Cretans and Arabians—we hear them telling in our own tongues the mighty works of God.” And all were amazed and perplexed, saying to one another, “What does this mean?” (Acts 2:8–12, ESV)
For unto us was the gospel preached, as well as unto them: but the word preached did not profit them, not being mixed with faith in them that heard it. (Hebrews 4:2, AV)