Even while living in Salant, it happened once that Rabbi Israel [Salanter] was unable to be present when his shemurah matzah was being baked. Knowing that he took the greatest pains to observe all the finer points involved in the baking of the matzah, his disciples had undertaken to supervise for him in his absence. They asked for his instructions. What should they be most careful to watch?
Rabbi Israel ordered them to be especially careful not to distress the woman kneading the dough in their zeal, since she was an unfortunate widow, and they would thereby transgress the prohibition, "You shall not oppress a widow..." "The kashrut of the matzah is not complete with the observance of all the embellishments of the laws of Pesach alone," he would say, "But with the observance of all the finer points of the Choshen Mishpat as well." --from The Mussar Movement Volume 1, Part 2, pages 220 - 221
Rabbi Salanter was washing his hands before a meal when the rabbis he was with noticed he was not immersing his whole hands in water in the ritual manner preferred by Jewish law. When questioned about this practice, Rabbi Salanter responded:
“I am not the one who obtains the water from the well; it is the poor peasant girl who must do so. Several times a week in the middle of this bitter winter, she must trudge out to the well, break the ice, and bring back pails of water for us to use in our home. The more water I use to wash my hands, the more often she has to face the bitter cold. And I do not want to be extra pious on the shoulders of her suffering.”