शिलवृत्त्योञ्छवृत्त्या च गुरुदक्षिणयार्जितम् । शुद्धद्रव्यमिति प्राहुस्तत्पूर्णफलदं विदुः ३९ ।
That which is acquired by gleaning more than one ear of corn at a time or gleaning corns one by one, by fees received from disciple is called Śuddhadravya (clean wealth). This wealth yields complete benefit.