Skandapurana 5.144.29

5.144.29

śukreṇa kathitaṃ sarvaṃ māghakṛṣṇe niśāgame ..
caturdaśyāṃ śucirbhūtvā yastalliṃgaṃ prapūjayet ..
kālāghrāto'pi na prāṇaiḥ sa pumāṃstyajyate kvacit ..29..

as all was told by Śukra: "Whoever, becoming pure, worships that liṅga / on the arrival of night on the fourteenth of the dark fortnight of Māgha, / though sniffed by Death, he is never abandoned by his life-breaths.