SamTgJ Ex3:6 :וכסה משה אפיו‏ : Moses covered his face
See the entire entry for ksy vb. to conceal

SamTgJ Ex3:6 :הלא דעל מסתכלה להאלהים‏ : because he feared to look at God
See the entire entry for skl#2 vb. D to understand; Dt to look at