Jamieson, Fausset and Brown on 1 Corinthians 9:4

4. Have we not power--Greek, "right," or lawful power, equivalent to "liberty" claimed by the Corinthians (1Co 8:9). The "we" includes with himself his colleagues in the apostleship. The Greek interrogative expresses, "You surely won't say (will you?) that we have not the power or right," &c.

eat and drink--without laboring with our hands (1Co 9:11, 13, 14). Paul's not exercising this right was made a plea by his opponents for insinuating that he was himself conscious he was no true apostle (2Co 12:13-16).