Skandapurana 6.3.10.58

6.3.10.58

ye narmadātīramupetya viprāḥ śaive vrate yatnamupaprapannāḥ .
trikālamambhaḥ pravigāhya bhaktyā devaṃ samabhyarcya śivaṃ vrajanti .. 10.58 ..

Those brahmins who, having reached the bank of the Narmadā, engage in the Śaiva vow, / plunging into the water at the three junctions of the day, worshipping the god with devotion, attain Śiva.