Pseudo-Kallisthenes 3.1.2-4

...so said the military leaders to the camps: `We have made enough war in Persia and conquered Dareios who claimed taxes from the Hellenes, but what are we accomplishing by marching against the Indians, in scary lands and doing things improper for Hellas?

If Alexander has become full of himself and wishes to be a warrior, and subjugate barbarian peoples why do we follow him? Let him move on alone and engage in wars. Having heard these Alexander separated the Persian host from the Macedonians and the other Hellenes and addressed them...