Shiva Purana
ब्राह्मणाः क्षत्रिया वैश्या मध्ये शूद्राश्च भूयशः॥ इज्या युद्धपणा सेवा वर्तयन्तो व्यवस्थिताः ॥ ७॥
In the middle live the Brahmins, Kṣatriyas, Vaiśyas and Śūdras maintaining themselves by sacrifices, battles, merchandise and service.
english translation
brAhmaNAH kSatriyA vaizyA madhye zUdrAzca bhUyazaH॥ ijyA yuddhapaNA sevA vartayanto vyavasthitAH ॥ 7॥
hk transliteration by Sanscript