Ramayana
तस्मात्पुत्रेषु दारेषु मित्रेषु च धनेषु च । नातिप्रसङ्गः कर्तव्यो विप्रयोगो हि तैर्ध्रुवम् ॥ 7-52-12 ॥
"Therefore one should not form excessive attachment to sons, to wives, to friends, or to wealth, for separation from them is certain."
english translation