Maha Upanishad 6.72
अयं निजः परो वेति गणना लघुचेतसाम्। उदारचरितानां तु वसुधैव कुटुम्बकम्॥
ayaṁ nijaḥ paro veti gaṇanā laghu-cetasām, udāra-caritānāṁ tu vasudhaiva kuṭumbakam
This is mine and that is another's — such is the calculation of the small-minded; for those of noble conduct the whole world is but one family.