Shiva Purana
अष्टमूर्तिषु सर्वासु मूर्तिर्वै पार्थिवी वरा । अनन्यपूजिता विप्रास्तपस्तस्मान्महत्फलम् ८ ।
Among the eight cosmic bodies of Śiva, the Earthen body is the best. Since it is not worshipped by any one else O Brāhmaṇas! it yields great benefit.
english translation
aSTamUrtiSu sarvAsu mUrtirvai pArthivI varA । ananyapUjitA viprAstapastasmAnmahatphalam 8 ।
hk transliteration by Sanscript