Hebrews 12:21 The sight was so terrifying that Moses said, "I am trembling with fear." [NIV]
Hebrews 12:21 and, (so terrible was the sight,) Moses said, 'I am fearful exceedingly, and trembling.' [YLT]
Hebrews 12:21 [a] And [b] so [c] terrible [d] was [e] the [f] sight, {that} [g] Moses [h] said, [i] I [j] exceedingly [i] fear [a] and [k] quake:)
[a] And = kaii (kahee) [2532]: and, also, even, so then, too, etc.;
[b] so = houto (hoo'to) [3779; 3778]: in this way (referring to what precedes or follows).
[c] terrible = phoberos (fob-er-os') [5398; 5401]: frightful: [DEF: Frightful = Too awful to be described], i.e. (objectively) formidable [DEF: Formidable = Imposing a severe test of bodily or spiritual strength; Causing or able to cause fear]:
[d] was = en (ane) [2258]: I (thou, etc.) was (wast or were):
[e] the = tou (tou) [3588; 3739]: he (hay); to (to); the: THAYER'S this, that, these, etc.
[f] sight = phantazo (fan-tad'-zo) [5324; 5316]: to make apparent [DEF: apparent = Readily seen, perceived, or understood], i.e. (passively) to appear (neuter participle as noun, a spectacle):
[g] Moses = Moseus (moce-yoos') [3475; OT:4872]: "drawing out," Moses, the Hebrew lawgiver:
[h] said = epo (ep'-o) [2036]: (used only in the definite past tense); to speak or say (by word or writing):
[i] I ... fear = eimi (i-mee') [1510]: I exist (used only when emphatic).
[j] exceedingly = ekphobos (ek'-fob-os) [1630; 1537; 5401]: frightened out of one's wits: sore afraid, exceedingly fear.
[k] quake = entromos (en'-trom-os) [1790; 1722; 5156]: terrified: