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Bg 18.44

kṛṣi-go-rakṣya-vāṇijyaṁ
vaiśya-karma svabhāva-jam
paricaryātmakaṁ karma
śūdrasyāpi svabhāva-jam
Synonyms: 
kṛṣi — plowing; go — of cows; rakṣya — protection; vāṇijyam — trade; vaiśya — of a vaiśya; karma — duty; svabhāva-jam — born of his own nature; paricaryā — service; ātmakam — consisting of; karma — duty; śūdrasya — of the śūdra; api — also; svabhāva-jam — born of his own nature.
Translation: 
Farming, cow protection and business are the natural work for the vaiśyas, and for the śūdras there are labor and service to others.