This isn't true, salvation is a 1x event, sanctification is a lifelong process.

But to this day whenever Moses is read, a veil lies over their heart, but whenever a person turns to the Lord, the veil is taken away. Now the Lord is the Spirit, and where the Spirit of the Lord is, there is freedom. But we all, with unveiled face, beholding as in a mirror the glory of the Lord, are being transformed into the same image from glory to glory, just as from the Lord, the Spirit.

2 Cor 5:15-18