On the next day, their magistrates and elders and scribes (Sanhedrin, Jewish High Court) were gathered together in Jerusalem; and [c]Annas the high priest was there, and [d]Caiaphas and [e]John and Alexander, and all others who were of high-priestly descent. When they had put the men in [f]front of them, they repeatedly asked, “By what sort of power, or in what name [that is, by what kind of authority], did you do this [healing]?” Then Peter, filled with [the power of] the Holy Spirit, said to them, “Rulers and elders of the people [members of the Sanhedrin, the Jewish High Court], if we are being put on trial today [to interrogate us] for a good deed done to [benefit] a disabled man, as to how this man has been restored to health, let it be known and clearly understood by all of you, and by all the people of Israel, that in the name of Jesus Christ the Nazarene, whom you [demanded be] crucified [by the Romans and], whom God raised from the dead—in this name [that is, by the authority and power of Jesus] this man stands here before you in good health. This Jesus is the stone which was despised and rejected by you, the builders, but which became the [g]chief Cornerstone. And there is salvation in no one else; for there is no other name under heaven that has been given among people by which we must be saved [for God has provided the world no alternative for salvation].” – Acts 4:5-12
At that very instant, having received a fresh measure of the gifts and graces of the Spirit, besides what he had poured forth upon him at the day of Pentecost; so that he had great courage and presence of mind, and freedom of speech, as Christ had promised his disciples they should have, when they were brought before governors and magistrates. The case was much altered with Peter, he who but a little while ago was frightened by a servant maid, now stands before the Jewish sanhedrin, with undaunted courage and resolution – Gill
And with great ability and power the apostles were continuously testifying to the resurrection of the Lord Jesus, and great grace [God’s remarkable lovingkindness and favor and goodwill] rested richly upon them all. – Acts 4:33
This idea of filling is almost always associated with this extraordinary power for ministry in the book of Acts.
Do not get drunk with wine, for that is wickedness (corruption, stupidity), but be filled with the [Holy] Spirit and constantly guided by Him. – Ephesians 5:18
The illustration of a person whose whole body has been affected by wine is used to describe how the Spirit of God, who indwells every believer, can extend His ministry and His power to all aspects of an individual Christian’s life. The filling of the Spirit is not getting more of the Spirit, but it is a question of the Holy Spirit empowering and getting control. In contrast to the permanence of the new birth and the indwelling Holy Spirit, the filling of the Spirit is a repeated experience. That is why Ephesians 5:18 translated literally is “keep being filled.” – John Walvoord