Shiva Purana
ते तु संहृष्टहृदयं ज्ञात्वा तं वै मुनीश्वराः ॥ प्रणवार्थावगत्यर्थमूचुः प्रास्ताविकं वचः ॥ १३॥
On seeing him pleased at heart the sages spoke in relevance to the context, in order to know the meaning of Praṇava.
english translation
te tu saMhRSTahRdayaM jJAtvA taM vai munIzvarAH ॥ praNavArthAvagatyarthamUcuH prAstAvikaM vacaH ॥ 13॥
hk transliteration by Sanscript