Shiva Purana
वायव्यां पुनरैशान्यां चतुर्दिक्षु ततः परम् ॥ गर्भावरणमाख्यातं मन्त्रसंघातमेव वा ॥ ५ ॥
Then, on the north-west, in the north-east, in the four directions. The covering of the womb or the collection of mantras is described.
english translation
vAyavyAM punaraizAnyAM caturdikSu tataH param ॥ garbhAvaraNamAkhyAtaM mantrasaMghAtameva vA ॥ 5 ॥
hk transliteration by Sanscript