The renowned gabbai tzedakah Reb Dovid Leib Schwartz zt'l meticulously kept Shabbos properly. Even in the concentration camp during the War, he kept Shabbos as best as possible.
One week he told his friends he wanted to eat three meals on Shabbos. His friends laughed at him because they only received a small piece of bread in the morning and nothing else. But he didn't let their teasing prevent him from hoping and aspiring to eat three meals on Shabbos.
On Erev Shabbos, their barrack commander gave everyone a loaf of bread and explained, "The bread isn't for today. We will be trekking for three days on Sunday, and this is all you will have. Save the bread for then."
Reb Dovid Leib didn't heed the warning. This was the opportunity he had prayed for. He made Kiddush on the bread on Friday night and ate a piece. He ate another piece in the morning and finished it at shalosh seudos.
He didn't know how he would walk for three days without food, but in the meanwhile, he was happy that he had eaten three meals on Shabbos.
After Shabbos, their commander informed them that there was a change of plans. "Everyone must return the bread. We won’t be traveling after all." They all returned the loaf of bread except for Reb Dovid Leib, who had already eaten it l'kovod Shabbos.
