Shiva Purana

siva.sh/siva-purana/uma-samhita/18/30

विप्रक्षत्रियवैश्यास्ते शूद्राश्च मुनिसत्तम ।। कल्पवृक्षसमानस्तु तन्मध्ये सुमहातरुः ।। ३० ।।

sanskrit

O excellent sage, there are brahmins, Kṣatriyas, Vaiśyas and Śūdras there. In its middle there is a big tree like the celestial Kalpa tree.

english translation

viprakSatriyavaizyAste zUdrAzca munisattama || kalpavRkSasamAnastu tanmadhye sumahAtaruH || 30 ||

hk transliteration by Sanscript