Филиппийцам 1:15

"Some indeed are preaching Christ even for envy, that is, to carry out the envy which they felt towards Paul, on account of the success of the Gospel in the capital of the world, owing to his steadfastness in his imprisonment; they wished through envy to transfer the credit of its progress from him to themselves. Probably Judaizing teachers (Rom. 14:1-23; Co1 3:10-15; Co1 9:1, &c.; Co2 11:1-4). some also of--rather, "for" good will--answering to "the brethren" (Phi 1:14); some being well disposed to him.

He begins with the inscription and benediction (Phi 1:1, Phi 1:2). He gives thanks for the saints at Philippi (Phi 1:3-6). He speaks of his great affection and concern for their spiritual welfare (Phi 1:7, Phi 1:8), his prayers for them (Phi 1:9-11), his care to prevent their offence at his sufferings (Phi 1:12-20), his readiness to glorify Christ by life or death (Phi 1:21-26), and then concludes with a double exhortation to strictness and constancy (Phi 1:27-30).

1:15-18 some are preaching out of jealousy and rivalry: They evidently were believers who were critical of Paul (cp. 2 Cor 10–13; Gal 4:12-20; 5:7-12). Even so, the message about Christ was being preached, so Paul rejoiced.