Bhagavad Gita 18.44

कृषिगौरक्ष्यवाणिज्यं वैश्यकर्म स्वभावजम्।परिचर्यात्मकं कर्म शूद्रस्यापि स्वभावजम् ॥१८.४४॥

kṛṣigaurakṣyavāṇijyaṃ vaiśyakarma svabhāvajamparicaryātmakaṃ karma śūdrasyāpi svabhāvajam

Agriculture, cattle-rearing, and trade are the duties of the Vaisya (merchant), born of their own nature; and service is the duty of the Sudra (servant-class), born of their own nature.

गीता