Skanda Purana — Brahma Khanda, Shloka 13
एतेन मंत्रराजेन सर्वोपनिषदात्मना । लेभिरे मुनयः सर्वे परं ब्रह्म निरामयम्
etena maṃtrarājena sarvopaniṣadātmanā | lebhire munayaḥ sarve paraṃ brahma nirāmayam
அனைத்து உபநிஷத்துகளின் சாரமாயுள்ள இந்த மந்திரராஜத்தால் எல்லா முனிவரும் நோயற்ற பரம்பிரம்மத்தை அடைந்தனர்.
Deductive attribution: Purāṇic narrator in Brahmottara-khaṇḍa (likely Sūta/compilational voice)
Scene: Sages in meditation; above them, a crown-like mantra (mantra-rāja) radiates, and Upaniṣadic mahāvākyas appear as streams merging into a single luminous Brahman-light, free of blemish.
FAQs
The Śiva-mantra is equated with Upaniṣadic wisdom and is said to lead to realization of the supreme Brahman.
No tīrtha is mentioned; the emphasis is on mantra as a direct spiritual means.
Reliance on (and practice of) the mantra—especially japa—as the means to the highest attainment.