Shiva Purana
भूतानि चेन्द्रियैर्जाता लीयन्ते ऽत्र शिवाज्ञया ॥ अत एव शिवो लिंगो लिंगमाज्ञापयेद्यतः ॥ १० ॥
The Bhūtas with the sense-organs merge into this at the bidding of Śiva, He is Liṅgin since he commands the Liṅga.
english translation
bhUtAni cendriyairjAtA lIyante 'tra zivAjJayA ॥ ata eva zivo liMgo liMgamAjJApayedyataH ॥ 10 ॥
hk transliteration by Sanscript