Do you see the connection?
Isaiah 28:11-12 NKJV For with stammering lips and another tongue He will speak to this people, [12] To whom He said, “This is the rest with which You may cause the weary to rest,” And, “This is the refreshing”; Yet they would not hear.
Acts 2:4 NKJV And they were all filled with the Holy Spirit and began to speak with other tongues, as the Spirit gave them utterance.
Acts 2:7-8 NKJV Then they were all amazed and marveled, saying to one another, “Look, are not all these who speak Galileans? [8] And how is it that we hear, each in our own language in which we were born?
1 Corinthians 14:22 NKJV Therefore tongues are for a sign, not to those who believe but to unbelievers; but prophesying is not for unbelievers but for those who believe.
Hebrews 4:9-10 NKJV There remains therefore a rest for the people of God. [10] For he who has entered His rest has himself also ceased from his works as God did from His.