Bhagavad Gita Chapter 18, Verse 44

कृषिगौरक्ष्यवाणिज्यं वैश्यकर्म स्वभावजम् | परिचर्यात्मकं कर्म शूद्रस्यापि स्वभावजम् ||

kṛṣi-gaurakṣya-vāṇijyaṁ vaiśya-karma svabhāva-jam paricaryātmakaṁ karma śūdrasyāpi svabhāva-jam

Agriculture, cattle-rearing, and commerce constitute the duty of vaishyas, born of their nature. Service-oriented duty is also that of shudras, born of their nature.

Krishna explains the duties of vaishyas and shudras together. 'Kṛṣi-gaurakṣya-vāṇijyaṁ vaiśya-karma svabhāva-jam'—agriculture (kṛṣi), cattle-rearing (gaurakṣya), and commerce (vāṇijyam) constitute the duty of vaishyas (vaiśya-karma), born of their nature (svabhāva-jam). 'Paricaryātmakaṁ karma śūdrasyāpi svabhāva-jam'—service-oriented duty (paricaryātmakam karma) is also (api) that of shudras (śūdrasya), born of their nature (svabhāva-jam). These are duties suited to those whose nature inclines toward trade, agriculture, business, or service. Vaishyas are those whose nature inclines toward commerce, agriculture, and business. Shudras are those whose nature inclines toward service. This is not about birth—it's about natural qualities and inclinations. Both are important and contribute to society in their own ways.