Complete Zechariah 4:6: "Not by might nor by power, but by My ..."

Answer: Spirit

This word of the LORD to Zerubbabel promised the temple would be completed "not by might nor by power, but by My Spirit."

“So he said to me, “This is the word of the LORD to Zerubbabel: Not by might nor by power, but by My Spirit, says the LORD of Hosts.”— Zechariah 4:6 (BSB)