NET
26 Then his voice shook the earth, but now he has promised, “I will once more shake not only the earth but heaven too.”
Darby
26 whose voice then shook the earth; but now he has promised, saying, Yet once will *I* shake not only the earth, but also the heaven.
KJV
26 Whose voice then shook the earth: but now he hath promised, saying, Yet once more I shake not the earth only, but also heaven.