We shall chant this verses when we are observing Eight Precepts.
Buddhist is encourage to observe Eight Precepts on Uposatha Observance Day.
In general, Uposatha is observed about once a week in Theravada countries in accordance with the four lunar phases: the new moon, the full moon, and the two quarter moons in between. In some communities, such as in Sri Lanka, only the new moon and full moon are observed as uposatha days
