Hello burwelm,
John 20:19-23:
19: On the evening of that day, the first day of the week, the doors being shut where the disciples were, for fear of the Jews, Jesus came and stood among them and said to them, "Peace be with you." 20: When he had said this, he showed them his hands and his side. Then the disciples were glad when they saw the Lord. 21: Jesus said to them again, "Peace be with you. As the Father has sent me, even so I send you." 22: And when he had said this, he breathed on them, and said to them, "Receive the Holy Spirit. 23: If you forgive the sins of any, they are forgiven; if you retain the sins of any, they are retained."
2 Cor. 5:17-20:
17 Therefore, if any one is in Christ, he is a new creation; the old has passed away, behold, the new has come. 18 All this is from God, who through Christ reconciled us to himself and gave us the ministry of reconciliation; 19 that is, in Christ God was reconciling the world to himself, not counting their trespasses against them, and entrusting to us the message of reconciliation. 20 So we are ambassadors for Christ, God making his appeal through us. We beseech you on behalf of Christ, be reconciled to God.
James 5:13-16
13 Is any one among you suffering? Let him pray. Is any cheerful? Let him sing praise. 14 Is any among you sick? Let him call for the elders of the church, and let them pray over him, anointing him with oil in the name of the Lord; 15 and the prayer of faith will save the sick man, and the Lord will raise him up; and if he has committed sins, he will be forgiven. 16 Therefore confess your sins to one another, and pray for one another, that you may be healed. The prayer of a righteous man has great power in its effects.
Acts 19:17-19
17 And this became known to all residents of Ephesus, both Jews and Greeks; and fear fell upon them all; and the name of the Lord Jesus was extolled. 18 Many also of those who were now believers came, confessing and divulging their practices. 19 And a number of those who practiced magic arts brought their books together and burned them in the sight of all; and they counted the value of them and found it came to fifty thousand pieces of silver.
Lev. 5:4-6:
4: Or if any one utters with his lips a rash oath to do evil or to do good, any sort of rash oath that men swear, and it is hidden from him, when he comes to know it he shall in any of these be guilty. 5: When a man is guilty in any of these, he shall confess the sin he has committed, 6: and he shall bring his guilt offering to the LORD for the sin which he has committed, a female from the flock, a lamb or a goat, for a sin offering; and the priest shall make atonement for him for his sin.
Lev. 19:20-22
20: "If a man lies carnally with a woman who is a slave, betrothed to another man and not yet ransomed or given her freedom, an inquiry shall be held. They shall not be put to death, because she was not free; 21: but he shall bring a guilt offering for himself to the LORD, to the door of the tent of meeting, a ram for a guilt offering. 22: And the priest shall make atonement for him ;with the ram of the guilt offering before the LORD for his sin which he has committed and the sin which he has committed shall be forgiven him.
I hope these passages answer your question regarding Catholics and confession.
If not would you like more biblical passages?
Peace