A.T. Robertson Commentary Luke 16:30

"And he said, Nay, father Abraham: but if one go to them from the dead, they will repent." — Luke 16:30 (ASV)

They will repent (μετανοησουσιν). The Rich Man had failed to do this and he now sees that it is the one thing lacking. It is not wealth, not poverty, not alms, not influence, but repentance that is needed. He had thought repentance was for others, not for all.