Yes, you must first believe but salvation is more than that.
You must repent and believe!

Mark 1:15 ... And saying, The time is fulfilled, and the kingdom of God is at hand: repent ye, and believe the gospel.
Acts 19:4 ... Then said Paul, John verily baptized with the baptism of repentance, saying unto the people, that they should believe on him which should come after him, that is, on Christ Jesus.
Psalm 24:3-5 ... Who shall ascend into the hill of the Lord? or who shall stand in his holy place? He that hath clean hands, and a pure heart; who hath not lifted up his soul unto vanity, nor sworn deceitfully. He shall receive the blessing from the Lord, and righteousness from the God of his salvation. ❤