What does the Nazi officer demand the villagers to do first after getting out of the trucks?

The first thing the Nazi officer tells them to do after they leave the trucks is to "lie down".

".. . lie down" was all she heard.
"What? Here? On the ground?" someone cried out.
"Of course, Jew," came the officer's voice. "And then my men will move among you and take your papers and jewelry for safekeeping."