Skanda Purana 6.2.84.60

6.2.84.60

avitatho'yaṃ mama śāpastasmādanyajanmani dardurarājo bhūtvā tvaṃ hi duhitaramikṣvākukulotpannāya sarvaguṇānvitāya dattvā yadā yāsyasi mahākālavane tasyottaradigbhāge tadā liṃgasya darśanena muktimavāpsyasi .. 41 ..

'This curse of mine cannot be false. Therefore, having become a frog king in another birth, when you give your daughter to one born in the Ikṣvāku lineage endowed with all virtues, and then go to the Mahākāla forest, in the northern quarter thereof, then by the darśana of the liṅga you will attain liberation.' [41]