Aghora-Mantra Japa: Graded Expiations, Pañcagavya Purification, and Homa for Mahāpātaka-Nivṛtti
उपांशु यच्चतुर्धा वै वाचिकं चाष्टधा जपेत् पातकादर्धमेव स्याद् उपपातकिनां स्मृतम्
upāṃśu yaccaturdhā vai vācikaṃ cāṣṭadhā japet pātakādardhameva syād upapātakināṃ smṛtam
One should repeat the mantra in a low voice (upāṁśu) fourfold, and aloud (vācika) eightfold. It is taught that for those burdened by secondary sins (upapātakas), the fruit is only half of that gained in the case of grave sins (pātakas).
Suta Goswami (narrating traditional injunctions within the Linga Purana discourse to the sages of Naimisharanya)
It gives a practical rule for mantra-japa used in Shiva-puja, distinguishing low-voiced and aloud recitation as measurable disciplines supporting purification before (and during) Linga worship.
By framing japa as a means to lessen sin and bondage, it implies Shiva as Pati—the liberating Lord—approached through mantra, which refines the pashu (soul) and loosens pasha (impurity/bondage).
Mantra-japa discipline: upāṁśu-japa (low-voiced) and vācika-japa (aloud), prescribed in specific multiples as part of Shaiva purification and preparatory practice aligned with Pashupata-oriented sadhana.