It will be a hard day for the unbelievers. It will be a day when the unjust will bite their fingers, (regretfully) saying, "Would that we had followed the path of the Messengers
And the Day when the wrong-doer (of every type) will bite at his hands; He will say: "Oh! If only I had taken a (Straight) path with the Messenger (of Allah)
And that Day, every wrongdoer will bite his hands (in fury and frustration and) will say: ‘Would that I had taken the path (of guidance by joining) the companionship of the Holy Messenger (blessings and peace be upon him)
And (remember) the Day when the Zalim (wrong-doer, oppressor, polytheist, etc.) will bite at his hands, he will say: "Oh! Would that I had taken a path with the Messenger ( Muhammad SAW)
At that time, the one who wronged himself (by failing to experience the reality of his original self) will bite his hands and say, “I wish I had walked on the path of the Rasul.”
Sayyed Abbas Sadr-Ameli
And on the day when the unjust one shall bite his hands, saying: 'Oh! Would that I had taken a way alone with the Messenger'
Al-muntakhab fi tafsir al-Qur'an al-Karim
This is the day the wrongful of actions shall bite his hands to intimate regret for all that he had done and for what he had left undone; he will wish he had taken the same path taken by the Messenger