Bhagavad Gita 12.18

सम: शत्रौ च मित्रे च तथा मानापमानयो: ।
शीतोष्णसुखदु:खेषु सम: सङ्गविवर्जित: ॥

sama: śatrau ca mitre ca tathā mānāpamānayo:
śītoṣṇa-sukha-du:kheṣu sama: saṅga-vivarjita: – 18

A devotee who has evenness towards enemy and friend, honour and dishonour, happiness and unhappiness which are like cold and heat, who remains free of wrong identification (clinging)