Shiva Purana
वदेद्यदि महामोहाद्रौरवं नरकं व्रजेत् ॥ मनसा कर्मणा वाचा गुरुमुद्दिश्य यत्नतः ॥ ३२ ॥
If one speaks these words out of great delusion, he will go to hell. One should endeavor to address the spiritual master by one’s mind, actions and words.
english translation
vadedyadi mahAmohAdrauravaM narakaM vrajet ॥ manasA karmaNA vAcA gurumuddizya yatnataH ॥ 32 ॥
hk transliteration by Sanscript