Skandapurana 1.3.7.94

1.3.7.94

tasmācchivaḥ smaryatāṃ cāśu devāḥ paraḥ parāṇāmapi vā paraśca..
parātparaḥ paramānaṃdarūpo yogidhyeyo niṣprapaṃco hyarūpaḥ.. 9.94 ..

Therefore let Śiva be remembered quickly, O gods! He is higher even than the highest, / higher than the highest, the nature of supreme bliss, to be meditated on by yogins, free from phenomenal reality, formless.”