Mahabharata 13.35.23

13.35.23

pratigraheṇa tejo hi viprāṇāṃ śāmyate'nagha |
pratigrahaṃ ye neccheyuste'pi rakṣyāstvayānagha || 23 ||

Do thou always worship them with gifts and obedient services: if, indeed, thou wishest to enjoy the sovereignty of the whole Earth with her belt of seas. The energy and might of Brahmanas, O sinless one, become abated in consequence of the acceptance of gift. Thou shouldst protect thy race. O king, from those Brahmanas that do not desire to accept gifts!'"