Shiva Purana
समुत्सृजामि भगवन्व्रतमेतत्त्वदाज्ञया ॥ इत्युक्त्वा लिंगमूलस्थान्दर्भानुत्तरतस्त्यजेत् ॥ ८२ ॥
O my lord, by your command I am releasing this vow. Having said this one should leave the darbha at the root of the Linga in the north.
english translation
samutsRjAmi bhagavanvratametattvadAjJayA ॥ ityuktvA liMgamUlasthAndarbhAnuttaratastyajet ॥ 82 ॥
hk transliteration by Sanscript