Be found in him (ευρεθω εν αυτω). First aorist (effective) passive subjunctive with ινα of ευρισκω. At death (2. Corinthians 5:3) or when Christ comes. Cf. Philippians 2:8; Galatians 2:17.

Through faith in Christ (δια πιστεως Χριστου). The objective genitive Χριστου, not subjective, as in Galatians 2:16; Galatians 2:20; Romans 3:22. Explained further by επ τη πιστε (on the basis of faith) as in Acts 3:16.