Shiva Purana
यदा शिवाय स्वात्मानं दत्तवान् देशिकात्मने ॥ तदा शैवो भवेद्देही न ततो ऽस्ति पुनर्भवः ॥ ५५ ॥
Since he has offered himself to Śiva as his devotee he shall ever remain so. He will have no rebirth thereafter.
english translation
yadA zivAya svAtmAnaM dattavAn dezikAtmane ॥ tadA zaivo bhaveddehI na tato 'sti punarbhavaH ॥ 55 ॥
hk transliteration by Sanscript