Final answer:
The first command given to the Jews upon exiting the train is context-dependent. During the Holocaust, it would have been commands by Nazi officers. In the Biblical context of the Exodus, it would have been to follow divine instructions via Moses.
Step-by-step explanation:
The question asks about the first command given to the Jews upon exiting the train, therefore, it is necessary to clarify the context of the question. If this pertains to the historical account of the Jews during the time of the Holocaust, the first command upon exiting the train in extermination camps, typically, would have been instructions by Nazi officers to form lines or groups for a selection process. Some members of the group would be sent directly to forced labor, while others to their deaths.
However, if the question is relating to a historical event from the Bible, such as the Exodus of the Jews from Egypt, the commands upon arrival at their destination would have been to follow the divine instructions as given by Moses, who emphasized the importance of adhering to the covenant with God and observing his commandments.