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Rom 14:4

Who are you to judge the servant of another? To his own master he stands or falls; and he will stand, for the Lord is able to make him stand.

Phl 1:6

For I am confident of this very thing, that He who began a good work in you will perfect it until the day of Christ Jesus.

Hbr 10:14

For by one offering He has perfected for all time those who are sanctified.

Hbr 12:2

fixing our eyes on Jesus, the author and perfecter of faith, who for the joy set before Him endured the cross, despising the shame, and has sat down at the right hand of the throne of God.