Bhagavad Gita 5.18

Sages look upon all equally, whether they be a minister of learning and humility, an infidel, a cow, an elephant, or a dog.

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

vidyāvinayasaṃpanne brāhmaṇe gavi hastini|
śuni caiva śvapāke ca paṇḍitāḥ samadarśinaḥ||

English translation (above): Shri Purohit Swami (1935), public domain. Sanskrit text via github.com/gita/gita (Unlicense).