On their release, Peter and John went back to their own people and reported all that the chief priests and the elders had said to them.
When they heard this, they raised their voices together in prayer to God.
“you made the heavens and the earth and the sea, and everything in them. You spoke by the Holy Spirit through the mouth of your servant, our father David: “
‘Why do the nations rage and the peoples plot in vain? The kings of the earth rise up and the rulers band together against the Lord and against his anointed one (Acts 4:26, Psalm 2:1-2). ’ Indeed Herod and Pontius Pilate met together with the Gentiles and the people of Israel in this city to conspire against your holy servant Jesus, whom you anointed. They did what your power and will had decided beforehand should happen. Now, Lord, consider their threats and enable your servants to speak your word with great boldness. Stretch out your hand to heal and perform signs and wonders through the name of your holy servant Jesus.”
After they prayed,
the place where they were meeting was shaken.
And they were all filled with the Holy Spirit and spoke the word of God boldly. Acts 4:23-31 NIV
Notice they prayed for boldness then they spoke with boldness.