Shiva Purana
यथेह कर्मणां स्थूलं मृत्काष्ठाद्यैः प्रकल्पितम् ॥ ध्यानयज्ञरतास्तस्माद्देवान्पाषाणमृण्मयान् ॥ ५५ ॥
Just as the gross materials of clay, wood and other materials are constructed in this world, Therefore, engaged in meditation and sacrifice, the demigods were made of stone and clay.
english translation
yatheha karmaNAM sthUlaM mRtkASThAdyaiH prakalpitam ॥ dhyAnayajJaratAstasmAddevAnpASANamRNmayAn ॥ 55 ॥
hk transliteration by Sanscript