Shiva Purana
सुप्रसन्नश्च विघ्नानि संहरिष्यति सर्वदा ॥ पुनश्चैवं शिवस्यैव वरं मन्त्रं प्रदास्यति ॥ ६२ ॥
If he is delighted he will remove all obstacles. The lore will yield the granting of the boon by Śiva.
english translation
suprasannazca vighnAni saMhariSyati sarvadA ॥ punazcaivaM zivasyaiva varaM mantraM pradAsyati ॥ 62 ॥
hk transliteration by Sanscript