The Great Epic of the Bhārata dynasty 2.19.45

2.19.45

snātakavratino rājanbrāhmaṇāḥ kṣatriyā viśaḥ |
viśeṣaniyamāścaiṣāmaviśeṣāśca santyuta || 45 ||

"Krishna said,--'O king, know us for Snataka Brahmanas. Brahmanas and Kshatriyas and Vaishyas are all, O monarch, competent to observe the vow of Snataka. This vow, besides, hath (many) especial and general rules. A Kshatriya observing this vow with especial rules always achieve prosperity. Therefore, have we decked ourselves with flowers. Kshatriyas again, O king, exhibit their energy by their arms and not in speech. It is, therefore, O son of Vrihadratha, that the speeches uttered by a Kshatriya are never audacious. O monarch, the creator hath planted his own energy in the aim of the Kshatriya. If thou wishest to behold it, thou shalt certainly behold it today. These are the rules of the ordinance, viz., that an enemy's abode should be entered through a wrong gate and a friend's abode through the right one. And know, O monarch, that this also is our eternal vow that having entered the foe's abode for the accomplishment of our purpose, we accept not the worship offered to us!"