Bhagavad Gita 13.10

Indifference, non-attachment to sex, progeny, or home, equanimity in both good fortune and bad;

असक्ितरनभिष्वङ्गः पुत्रदारगृहादिषु।नित्यं च समचित्तत्वमिष्टानिष्टोपपत्तिषु॥

asakitaranabhiṣvaṅgaḥ putradāragṛhādiṣu|nityaṃ ca samacittatvamiṣṭāniṣṭopapattiṣu||

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