While the Rebbe was at Yeshivat Rambam in Brooklyn, there was a bookkeeper who was very anxious to meet the Rebbe. When she approached the gabbaim, their response was typical: the Rebbe is here to see the students. If there is time afterward the adults can get a bracha too, or they can make an appointment and go see the Rebbe in Williamsburg. But, this woman was very determined and she started begging. The gabbai agreed and she went in. A week later the gabbai received a phone call from this woman. She explained that the Rebbe had demanded her husband to keep Shabbos. As they were a struggling family that had only recently moved from Israel, she tried explaining to the Rebbe that they needed the money to survive.
“Shabbos is the source of all blessing in this world. Your husband must not work on Shabbos,” the Rebbe told her.
“But we don't even have our green card yet and no one else will even hire us.”
“If you keep Shabbos, you will receive your green cards too,” the Rebbe said.