SB 9.4.45
yo mam atithim ayatam
atithyena nimantrya ca
adattva bhuktavams tasya
sadyas te darsaye phalam
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
Maharaja Ambarisa, you have invited me to eat as a guest, but instead of feeding me, you yourself have eaten first. Because of your misbehavior, I shall show you something to punish you.
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
A devotee cannot be defeated by a so-called mystic yogi. This will be proved by the failure of Durvasa Muni’s endeavor to chastise Maharaja Ambarisa. Harav abhaktasya kuto mahad-gunah (Bhag. 5.18.12). One who is not a pure devotee of the Supreme Lord has no good qualifications, however great a mystic, philosopher or fruitive worker he may be. Only a devotee emerges victorious in all circumstances, as will be shown in this incident involving the rivalry between Durvasa and Maharaja Ambarisa.