Mudgalapurana 6.38.49

6.38.49

dvija uvāca |
na dṛṣṭaḥ śailaje putro mayā tava na saṃśayaḥ |
śivasya śapathaṃ kṛtvā vadāmi paśya putrakam ||

The twice-born said: / “O daughter of the mountain, your son has not been seen by me, of this there is no doubt. / Swearing an oath by Śiva, I say: look for your little son!”