1 Corinthians 1:9

God is faithful It will not be God's fault, but our own, if the promises of the last verse are not realized.

the fellowship of his Son Jesus Christ The important word here rendered fellowshiphas unfortunately different renderings in our version. Sometimes, as in ch. 1 Corinthians 10:16 (where see note), it is rendered communion; and in 2 Corinthians 6:14, where it is thus rendered, another word is rendered fellowship. In 2 Corinthians 9:13, it is rendered distribution. Its usual signification would appear to be the sharing together, joint participationas common possessors of any thing. But it is impossible to go so far as Cremer in his Lexicon of the N. T. and assert that it never has the active sense of communication, in the face of such passages as Romans 15:26 (where it is rendered distribution); 2 Corinthians 9:13. Here it refers to the life which by means of faith is common to the believer and his Lord. Cf. Galatians 2:20.