Mark 4:12

so that, ‘they may be ever seeing but never perceiving, and ever hearing but never understanding; otherwise they might turn and be forgiven.’”

Note Isaiah 6:9–10 (see also LXX)

That seeing they may see, and not perceive; and hearing they may hear, and not understand; lest at any time they should be converted, and their sins should be forgiven them.

that ‘seeing they may see and not perceive, and hearing they may hear and not understand, lest perhaps they should turn again, and their sins should be forgiven them.’”

that seeing they may see, and not perceive; and hearing they may hear, and not understand; lest haply they should turn again, and it should be forgiven them.