Skandapurana 1.3.29.106

1.3.29.106

paṃcākṣarī yasya mukhe sthitā sadā cetonivṛttiḥ śivaciṃtane ca..
bhūteṣuḥ sāmyaṃ parivādamūkatā ṣaṃḍhatvameva parayoṣitāsu.. 31.106 ..

In whose mouth the five-syllable mantra is ever present, whose mind is withdrawn into meditation on Śiva,
who is impartial toward living beings, mute to slander, and truly impotent toward the wives of others— 31.106