Before Pesach Rabbi Yisrael Salanter was once unable to be present during the baking of this shmurah matzah, in which he was extremely meticulous. His disciples, who had undertaken to watch over the baking in his place, asked him for directions. R’ Yisrael instructed them to be extremely careful not to upset the woman who kneaded the dough and not to rush her, for she was widow, and to upset her would be a violation of the prohibition against oppressing widows and orphans. “The kashrus of the matzos is not complete,” added R’ Yisrael, “with hidurim in the laws of Pesach alone, but with the meticulous observance of the laws of behavior towards other people as well.”- from SPARKS OF MUSSAR