Following are a number of back-translations of Hebrews 12:21:

• Uma: «What the Yahudi people faced was very terrifying. Even the prophet Musa said: ‘I am afraid and shaking [emphatic].'» (Source: Uma Back Translation)
• Yakan: «What they saw was really frightening and even Musa was compelled-to-speak, he said, ‘I am shaking because of fright.'» (Source: Yakan Back Translation)
• Western Bukidnon Manobo: «And as for what they saw at that time, it was very frightening. And even Moses, he said that he was trembling because of his fear.» (Source: Western Bukidnon Manobo Back Translation)
• Kankanaey: «What could be seen and heard was extremely frightening, so even Moses said, ‘I admit I’m trembling with my fear.'» (Source: Kankanaey Back Translation)
• Tagbanwa: «When (one) looked at that mountain it really made- the-hair-on-the-back-of-the-neck -stand-on-end. That’s why, even Moises, he spoke saying, ‘I’m trembling with fear.'» (Source: Tagbanwa Back Translation)
• Tenango Otomi: «It was a very fearful thing which the people saw. Also even Moses said: ‘As for me, I am even shaking from fear.'» (Source: Tenango Otomi Back Translation)