4 And they were all filled with the Holy Spirit and began to speak with other tongues, as the Spirit gave them utterance.
And they were all filled with the Holy Spirit
The filling of the Spirit is distinct from the baptism of the Spirit. The baptism of the Spirit occurs at the point of salvation (Ro 6:3; 1 Co 12:13; Ga 3:27; Co 2:12). The baptism of the Spirit occurs once, whereas the filling of the Spirit occurs many times (Eph 5:18). Notably, the Holy Spirit filled “all” in the room, not just some particular persons.
Luke always associated the filling of the Spirit with sharing the gospel in Acts (Acts 2:4; 4:8, 31; 9:17; 13:9). He connected the filling with faithfully fulfilling their task as proclaimers (Acts 6:3, 5; 7:55; 11:24; 13:52).
There can be no spiritual life without the Life-Giver.
The Holy Spirit is indispensable for an effective church. Without the Spirit, the church would be ineffective. A body without breath is a corpse; the church without the life-giving Spirit is a dead organism.
It is important to distinguish between the baptism of the Spirit and the filling of the Spirit. Go to this study to see the difference: https://versebyversecommentary.com/articles/doctrine/baptism-of-the-spirit/baptism-in-the-spirit/