Galatians 1:12

For I neither received it of man, neither was I taught [it]. It could not be of man, for it did not come to him from man. No preacher or apostle taught it to him.

But by the revelation of Jesus Christ. It came by a direct revelation of Christ. The first revelation was on the way to Damascus (Ac 26:13-18). There were no doubt successive revelations (2Co 12:1).
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