‏ 1 Corinthians 1:9

 God is faithful ( πιστος ο θεος ). This is the ground of Paul's confidence as he loves to say (1Th 5:24; 1Co 10:13; Ro 8:36; Php 1:16). God will do what he has promised.

 Through whom ( δι' ου ). God is the agent ( δι' ) of their call as in Ro 11:36 and also the ground or reason for their call ( δι' ον ) in Heb 2:10.

 Into the fellowship ( εις κοινωνιαν ). Old word from  κοινωνος, partner for partnership, participation as here and 2Co 13:13f.; Php 2:1; 3:10. Then it means fellowship or intimacy as in Ac 2:42; Ga 2:9; 2Co 6:14; 1Jo 1:3, 7. And particularly as shown by contribution as in 2Co 8:4; 9:13; Php 1:5. It is high fellowship with Christ both here and hereafter.

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