Skandapurana 5.271.91_9

5.271.91_9

tataḥ śaktisvarūpaḥ syātso'kṣayī kīrtyate yataḥ ..
sadāśivasya niḥśvāsaḥ śaivaṃ varṣaśataṃ bhavet ..
ucchvāsastu punastasya śaktirūpeṇa saṃsthitaḥ .. 57 ..

Then he takes the nature of Śakti, for he is declared to be imperishable. / An out-breath of Sadāśiva is a hundred years of Śiva, / and his in-breath again abides as Śakti.