Bhagavad Gita · 5.18

विद्याविनयसम्पन्ने ब्राह्मणे गवि हस्तिनि।शुनि चैव श्वपाके च पण्डिताः समदर्शिनः॥

vidyā-vinaya-sampanne brāhmaṇe gavi hastini śhuni chaiva śhva-pāke cha paṇḍitāḥ sama-darśhinaḥ

The wise see with equal vision a learned and humble Brahmin, a cow, an elephant, a dog, and an outcaste.

— Bhagavad Gita 5.18

Source: Sacred-Texts.com (Sanskrit) + Bhagavad-Gita.io (translations)