They were born-again-believing Jews. Except for Judas.
Only by faith does anyone receive the Spirit to give them life. That only began in the NEW COVENANT to those who believed.
Those in the Upper Room all believe before the Spirit was poured out on them.
Acts 5:32 (WEB) 32 We are His witnesses of these things; and so also is
the Holy Spirit, whom God has given to those who obey him.
John 14:15-17 (WEB). . . 15
If you love me, keep my commandments. 16 I will pray to the Father, and he will give you another Counselor, that he may be with you forever: 17 the Spirit of truth
John 14:21 (WEB) 21
One who has my commandments and keeps them, that person is one who loves me. One who loves me will be loved by my Father, and I will love him, and will reveal myself to him.”
John 14:23 (WEB) 23 Jesus answered him, “
If a man loves me, he will keep my word. My Father will love him, and we will come to him, and make our home with him.
Acts 2:38 (WEB) 38 Peter said to them, “
Repent, and be baptized, every one of you, in the name of Jesus Christ for the forgiveness of sins, and you will receive the gift of the Holy Spirit.
Galatians 3:2 (WEB) 2 I just want to learn this from you: Did you receive the Spirit by the works of the law, or by hearing of faith?
Galatians 3:5 (NIV) 5 So again I ask, does God give you his Spirit and work miracles among you by the works of the law, or by your believing what you heard?
Galatians 3:13-14 (WEB) 13 Christ redeemed us from the curse of the law, having become a curse for us. For it is written, “Cursed is everyone who hangs on a tree,” [Deuteronomy 21:23] 14 that the blessing of Abraham might come on the Gentiles through Christ Jesus, that we might receive the promise of the Spirit
through faith.
Galatians 4:6 (WEB) 6 And because you are children, God sent out the Spirit of his Son into your hearts, crying, “Abba, Father!”
Ephesians 1:13-14 (WEB)
13 In him you also, having heard the word of the truth, the Good News of your salvation—in whom, having also believed, you were sealed with the promised Holy Spirit, 14 who is a pledge of our inheritance, to the redemption of God’s own possession, to the praise of his glory.