Numbers 9:18

18.At the commandment of the Lord. (2) The mouth is here used by metonymy for the speech; nor does there appear to me to be so much harshness in the Hebraism, but that it may be appropriately retained. But it is asked whether God actually spoke or not; for the word mouth is often repeated. It is indeed likely that Moses was instructed but once what was meant by the removal or remaining of the cloud; yet I doubt not but that the name of word, or commandment, was given to the sign, inasmuch as God speaks as much to the eyes by outward signs as He does to the ears by His voice. Still, from this mode of expression we may gather that the use of signs (3) is perverted and nullified, unless they are taken to be visible doctrine, as Augustin writes. The repetition, which certainly has no little force, shows how worthy this is of observation.