Shiva Purana
यन्त्रं तु देवतारूपं देवता विश्वरूपिणी ॥ विश्वरूपो गुरुः प्रोक्तश्शिष्यो गुरुवपुस्त्वतः ॥ ३२ ॥
Yantra is in the form of the deity; the deity is in the form of the universe; the preceptor too is in the form of the universe and the disciple is of the body of the preceptor.
english translation
yantraM tu devatArUpaM devatA vizvarUpiNI ॥ vizvarUpo guruH proktazziSyo guruvapustvataH ॥ 32 ॥
hk transliteration by Sanscript