Shiva Purana
सा दीक्षा शांभवी प्रोक्ता सा पुनर्भिद्यते द्विधा ॥ तीव्रा तीव्रतरा चेति पाशो पक्षयभेदतः ॥ ८ ॥
That initiation is called Śāmbhavī, and it is again divided into two kinds. The rope is called intense and intense, according to the wings.
english translation
sA dIkSA zAMbhavI proktA sA punarbhidyate dvidhA ॥ tIvrA tIvratarA ceti pAzo pakSayabhedataH ॥ 8 ॥
hk transliteration by Sanscript