Reference for Nedarim 180:2

מיתיבי קונם שאיני נהנה לפלוני ולמי שנשאל עליו נשאל על הראשון ואח"כ נשאל על השני אמאי אי בעי על האי ניתשיל ברישא ואי בעי על האי ניתשיל ברישא

— Who knows which one is first or which one is second?<span class="x" onmousemove="('comment',' V. p. 918, n. 5. ');">³</span> An objection is raised: [If he vows,] 'Konam that I benefit not from So-and-so, and behold! I will be a nazirite if I be absolved therefrom': he must be absolved of his vow, and then of his naziriteship. But why so? If he wishes, let him first be absolved of his vow, and if he wishes, let him first be absolved of being a nazirite! This is indeed a refutation.

Jastrow