Adam Clarke on 1 Corinthians 1:12

As touching our brother Apollos - It appears from this that the brethren, of whom the apostle speaks in the preceding verse, were then with him at Ephesus; I, with the brethren, greatly desired to come.

But his will was not at all to come - As there had been a faction set up in the name of Apollos at Corinth, he probably thought it not prudent to go thither at this time, lest his presence might be the means of giving it either strength or countenance.