Qur'anic verses - Resurrection Day:

The Unbelievers' usual cry: "What! when we are reduced to bones and dust, how can our personality be called to account?" The answer to that is God will bring them back to life and assemble their bones and skins even the most characteristic part of the body, the tips of their fingers.
It is interesting to mention that God's answer is a challenge to all people of all time, past and present and the challenge will remain for the coming generations. Only in modern time, forensic science explained that the tips of our fingers are the most characteristic feature of every individual.