I am not sure when this incident occurred or where it occurred. It was narrated by Gurmukh Pyare who have done Sangat of Bhai Sahib Randhir Singh jee.
Once in a Mela in Punjab, a Sadhu who subscribed to Advaita Vedanta philosophy, organized a stall. There on a table he placed a Jutti (Punjabi shoe), Quran, a Panj Granthi and other holy books. Many people were obviously upset at seeing this but he looked like a holy person and no one dared stop him. When some people questioned him, he responded with half-closed eyes that "Yeh bhee Brahm, voh bhee Brahm, main bhee Brahm hoon, tum bhee Brahm ho" (This is Brahm, that is Brahm, I am Brahm and you too are Brahm). Saying this he closed his eyes. He was implying that there is only Brahm who exists and the same Brahm is in the Jutti, Quran and so on. Using this spiritual truth, he was trying to insult and dishonour different religious texts.
To a Muslim he responded saying that "yeh (Quran) bhee Brahm hai, voh (jutti) bhee Brahm hai, main bhee Brahm hoon, kisee ka Tiraskaar nahi hooya" (Quran is also Brahm, the Jutti too is Brahm and I too am Brahm therefore there has been no dishonour of any holy book".
There was a Gursikh there who was quite upset but did not know how to react. He rushed and told Bhai Sahib Randhir Singh jee about this Be-adbi of Gurbani pothi. I am not sure if Bhai Sahib came the same day or the next day but Bhai Sahib soon arrived with Tyaar bar Tyaar Singhs. Bhai Sahib was obviously upset when he saw the insult of Panj Granthi Pothi. Bhai Sahib got hold of the Jutti and without giving any notice started hitting the Pakhandi Sadhu with the Jutti. Sooner than later, his intoxication of Pakhand was removed and he yelled as to what was going on.
Bhai Sahib smiled and said, "Brahm ne, Brahm se, Brahm kee Pitaaee kee". (Brahm (Bhai Sahib) beat up Brahm (Pakhandi) with Brahm (Jutti).
Now the Pakhandi came to senses and onlookers had a good laugh. Such Saint Soldier was Bhai Sahib Randhir Singh jee.