Or HaChaim on Exodus 33:14/אור החיים על שמות ל״ג:י״ד

1 ויאמר פני ילכו, "He said: 'My presence will go with you.'" Many commentators have addressed themselves to these verses. I believe the correct approach to these verses must be based on a comment in Tikkunim 18 that the Torah refers to the שכינה as פני ה׳, seeing this is the aspect of G'd visible to the Celestial Beings. This is also the allusion contained in the words of Exodus 23,15 ולא יראו פני ריקם, "they shall not see My Face (while) empty-handed." In our verse G'd is responding to Moses' arguments and informs him that He Himself will go with him as His attribute פני השם, i.e. the שכינה. Concerning the matter of Moses having reservations about such an arrangement, G'd added: והניחותי לך, "I will give you rest."

2G'd also meant that He would allow an extra-terrestrial light to rest on Moses, one that would not fade; at the same time whatever degree of spiritual light Moses had enjoyed thus far would continue, although seen from Israel's vantage point the Divine Presence שכינה would be perceived as preceding the people on their journeys. This was an aspect of G'd's attribute of דין, Justice, as is evident from the name with which G'd identified Himself here. [I believe that having said that the expression פני השם referred to the way G'd is manifest in Heaven, the author concludes that this is an aspect of דין, seeing there is no need for the attribute of Mercy in the Celestial Regions. Ed.] Moses responded to this offer by saying: "If Your presence will not go with me," in verse 15.