Shiva Purana
अण्डस्यांतर्बहिर्वाथ सकृदावर्तते पुनः ॥ ततो लब्ध्वा शिवज्ञानं परां भक्तिमवाप्य च ॥ २८ ॥
Then the egg revolves once inside or outside the egg. Then having attained knowledge of Lord Siva and attained supreme devotion.
english translation
aNDasyAMtarbahirvAtha sakRdAvartate punaH ॥ tato labdhvA zivajJAnaM parAM bhaktimavApya ca ॥ 28 ॥
hk transliteration by Sanscript