Shiva Purana
तेन तस्मै वरं प्रादान्मुनिः प्रीतस्त्रिशंकवे॥ छन्द्यमानो वरेणाथ वरं वव्रे नृपात्मजः॥ १६॥
The sage was pleased with Trishanku and gave him a boon Persuaded by the boon the prince asked for a boon.
english translation
tena tasmai varaM prAdAnmuniH prItastrizaMkave॥ chandyamAno vareNAtha varaM vavre nRpAtmajaH॥ 16॥
hk transliteration by Sanscript