Bhagavad Gita 13.10

असक्तिकरणभिश्वङ्ग: पुत्रदार्गृहादिषु |
नित्यं च समचित्तत्वमिष्ठानिष्टोपपत्तिषु

Translation

non-attachment; absence of clinging to spouse, children, home, and so on; even-mindedness amidst desired and undesired events in life