Bhagavatapurana 4.29.49

4.29.49

āstīrya darbhaiḥ prāg-agraiḥ kārtsnyena kṣiti-maṇḍalam /
stabdho bṛhad-vadhān mānī karma nāvaiṣi yat param /
tat karma hari-toṣaṃ yat sā vidyā tan-matir yayā //

49. Having covered the whole surface of the earth with Darbha grass pointed towards the east and haughty and puffed up with the extensive slaughter, thou dost not understand what karma is and the still higher thing, know then that is (indeed worthy) Karma which delights Hari and that is wisdom by which Hari is seen.