Shiva Purana
तत्रापि मम ते पुत्राश्चत्वारो योगसाधकाः ॥ भविष्यन्ति महात्मानस्तन्नामानि शृणुष्व मे ॥ २१ ॥
There also four sons will be born of me, all aspiring after the Yogic path and noble-souled. Please hear their names from me.
english translation
tatrApi mama te putrAzcatvAro yogasAdhakAH ॥ bhaviSyanti mahAtmAnastannAmAni zRNuSva me ॥ 21 ॥
hk transliteration by Sanscript