Is confirmation as a sacrament mentioned in the bible?
Now when the apostles in Jerusalem heard that Samaria had accepted the word of God, they sent them Peter and John, who went down and prayed for them, that they might receive the holy Spirit, for it had not yet fallen upon any of them; they had only been baptized in the name of the Lord Jesus.
Then they laid hands on them and they received the holy Spirit.
– Acts 8:14-17
When they heard this, they were baptized in the name of the Lord Jesus. And when Paul laid [his] hands on them, the holy Spirit came upon them, and they spoke in tongues and prophesied.