What are the circumstances needed to consider one's actions "מדידה של מצוה" (measuring for a mitzvah).
What Is the Halacha if Water Poured on Concrete Flows onto Grass?;
understanding the two views with "דרך לכלוך" (coloring destructively). (Wiping one's hands on a towel from grape juice, blood, pomegranate, colored ices, etc.);