'Oppression' in the Bible

They have no root in themselves, but are short-lived. When oppression or persecution arises because of the word, immediately they stumble.

for at that time there will be such tribulation as has not occurred, from the beginning of the creation which God made, until now—and never will [be again].

“But in those days, after [the suffering and distress of] that tribulation, the sun will be darkened, and the moon will not give its light,