Skandapurana 1.4.10.63

1.4.10.63

etadrahasyamidameva nṛṇāṃ pradhānaṃ kartavyamatra śivapūjanameva bhūpa..
yasyāṃtarāyapadavīmupayāṃti lokāḥ sadyoḥ naraḥ śivanataḥ śivameva satyam.. 12.63 ..

This is the secret; this alone is the foremost duty for men here: the worship of Śiva alone, O king. / If people pass through the path of obstacles, instantly the man who has bowed to Śiva becomes Śiva himself, in truth.