2.What was true of the saints in Corinth? .

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They were the seal of Paul’s apostleship in the Lord and his answer to those who were judging him.

If he was not an apostle to anyone else, at least he was to them. We may conclude from this statement that some of the early Christian assemblies were contesting Paul’s apostleship—perhaps because he was not one of the original twelve.

Or, this may be referring to the "I am of Apollos," "I am of Cephas" quarreling that was going on.