A well full of water and from which various creatures draw water, is said to take off half the sinful deeds of the person who has excavated it.
अर्धं पापस्य हरति पुरुषस्येह कर्मणः। कूपः प्रवृत्तपानीयः सुप्रवृत्तश्च नित्यशः॥