how did elies father respond when he learned his name had been written down?

Elie's father panics and runs to ind him. He wants to give him the only thing he has left to give.

"Look, take this knife," he said to me. "I don't need it any longer and it might be useful to you. And take this spoon as well. don't sell them. Quickly! Go on. Take what I'm giving you!"