Hathayoga 1-4

हठ-विद्यां हि मत्स्येन्द्र-गोरक्षाद्या विजानते ।

स्वात्मारामोऽथवा योगी जानीते तत्-प्रसादतः ॥ ४॥

Hathavidyām hi matsyendraghorakshādyā vijānate svātmārāmoathavā yogī jānīte tatprasādatah

Matsyendra, Goraksa, etc., knew Hatha Vidyâ, and by their favour Yogî Swâtmârâma also learnt it from them.