There is no Restriction to Chant नमः शिवाय !
It has become popular that Panchakshar Mantra can't be chanted without Guru Diksha. Primarily due to PREMANAND MAHARAJ. That's FALSE!!!
People also call Panchakshari (5 syllables) Mantra as ॐ नमः शिवाय। That's incorrect too. Adding ॐ makes it Shadakshari (6 syllables) Mantra.
Chanting Shadakshari may be debatable, but Chanting Panchakshari Mantra is TOTALLY ALLOWED!!! Here's why:
नास्य दीक्षा न होमश्च न संस्कारो न तर्पणम् ।
न कालो नोपदेशश्च सदा शुचिरयं मनुः |
English translation: This mantra requires no initiation, fire ritual, purification, or ancestor offerings. It also has no time restrictions or formal instruction requirements, as it is inherently pure.
SOURCE: Skanda Puran, Book 3, Section 3, Chapter 1, Panchakshari Mahatmya, Verse 21
So please bust these myths and chant Panchakshari Mantra freely. And please don't refer mantra with Om as Panchakshari Mantra, because that's Shadakshari Mantra.
नमः शिवाय 🙏