Shiva Purana
प्राणायामसमायुक्तस्सगर्भो जप उच्यते ॥ आद्यंतयोरगर्भो ऽपि प्राणायामः प्रशस्यते ॥ ३० ॥
The Japa performed with the prāṇāyāma is Sagarbha Japa. In the first and the last even Agarbha Prāṇāyāma is commended.
english translation
prANAyAmasamAyuktassagarbho japa ucyate ॥ AdyaMtayoragarbho 'pi prANAyAmaH prazasyate ॥ 30 ॥
hk transliteration by Sanscript