Skandapurana 6.3.103.201

6.3.103.201

anāśakaṃ nṛpaśreṣṭha jale vā tadanantaram .
pañcasāhasrikaṃ mānaṃ varṣāṇāṃ jātavedasi .. 103.201 ..

or afterwards by fasting, O best of kings, or in water, / the measure [of his stay] in the case of fire is five thousand years;