Arrian

“ Parmenio sent him immediately under guard to the king, who obtained the same intelligence from him. The king then, having collected his friends, proposed to them as a subject for deliberation what decision he ought to make in regard to this Alexander. The Companions thought that formerly he had not resolved wisely in confiding the best part of his cavalry to a faithless man, and that now it was advisable to put him out of the way as speedily as possible, before he became even more popular among the Thessalians and should try to effect some revolutionary plan with their aid. ”