The Meccan Revelations: Page 346 from Volume One

As for the one who permits him to travel and prohibits him in the city,

This is if the exaltation is an action, and it has no effect except on the learner, the listener, the receptive person, so the exaltation travels from the knowledgeable teacher to the learner on the mount of pronunciation and speech, with a phrase or a sign from the teacher to the learner .