A.T. Robertson Commentary Philippians 3:9

"and be found in him, not having a righteousness of mine own, [even] that which is of the law, but that which is through faith in Christ, the righteousness which is from God by faith:" — Philippians 3:9 (ASV)

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. 2:8; Galatians 2:17.

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