Discern, I would propose you consider these two out of a myriad of verses around this topic:
1 Corinthians 1v18
18 For the [
g]message of the cross is foolishness to
those who are perishing, but to us who are
being saved it is the power of God.
- this is the sanctification aspect, and its the BEING SAVED element (we are saved, are being saved, and will be saved). We are positionally saved through justification. We are being saved by the leading of the HS, and we will be saved by our glorification.
See this then in context of the following verse:
1 Corinthians 15v1,2
15 Moreover, brethren, I declare to you the gospel which I preached to you,
which also you received and in which you stand,
2 by which also you are saved, if you hold fast that word which I preached to you—
unless you believed in vain
>these ARE BELIEVERS. They received the gospel. They Stand currently in the gospel. They are currently saved (IF) they hold fast (remain in faith).
>those who once believed but then fell back, they believed in vain, for they didn't hold on.
>those who fall back are apostate.
So Justification, being a one time event, is very much paired with ongoing sanctification (process). Apostates are no longer justified.