Arjun Dagdu Supekar, brother of Bala Supekar, was one of the early Kasba Peth mandali members who devoted his life to Meher Baba. He owned a small tobacco and paan shop near the toddy shop in Kasba Peth, Poona, where Merwan Seth (as Meher Baba was then known) became one of his regular customers.

Merwan Seth would buy jarda, a strong type of chewing tobacco, and sit with Arjun chewing the tobacco and talking to him at length, inquiring about his business, finances, and family with sincere interest and sympathy. Arjun was deeply touched and eventually confessed that he was barely surviving financially. Merwan Seth began spending more time at Arjun's shop, buying tobacco and paan for Himself and others, and at times singing the songs of Tukaram, Swami Ramdas, and Kabir. Thus Arjun, a devout Hindu, became convinced that Merwan Seth was a spiritual figure. "His heart was fatally wounded by Merwan's arrow of love." Eventually, all of Arjun's family became devoted to Merwan Seth.

Arjun was a well-known local wrestler and regarded as one of the strongest men in Poona. He was assigned the duty of night watchman at Baba's hut. Baba told him: "Always remain awake and never be afraid of anything." One night, Arjun heard the rustling of leaves and was startled. Peering into the darkness, he saw two gigantic figures dressed in white robes who suddenly started becoming larger and more ominous, reaching almost 20 feet in height. Despite being one of the strongest men in Poona, Arjun became petrified and could not utter a sound. At that very moment, Baba emerged from the hut irritated and asked, "What's the matter with you?" When Arjun pointed into the darkness, nothing was visible. Baba scolded him and explained: "Those were ghosts who came to me seeking rebirth. Such spirits of the dead have committed suicide and are unable to take another birth for several centuries. Every night such ghosts come to me; so never be afraid. They won't harm you."

But Arjun's health began steadily deteriorating after this incident. His eyes became yellowish and his face pale, a condition that lasted until he dropped his body approximately four years later in December 1926.

On the morning after the Holi fire of 11 March 1922, Baba threw Arjun's tambura, along with Khodu's sitar and a tabla, into the dying fire as an offering. Later, Baba had the ashes buried and small clay models of the instruments erected over their "graves." This holi was transformed into the Master's dhuni (sacred fire).

The men mandali had observed that Baba loved Arjun more than any of them. Baba would always give His food leftovers to Arjun, and He had established some special bond with him. This was dramatically demonstrated when Baba, while inspecting the school at Meherabad, suddenly demanded that Vishnu strike His hand with a stick. Vishnu replied, "If you order me to do such a thing, I will commit suicide!" Baba then asked Rustom, who said he would prefer to leave Meherabad. But when Baba called Arjun and told him to strike His hand, Arjun at once picked up the stick and struck Baba. Baba then explained: "This is love; he who values my word loves me the most!" Pointing to Vishnu and Rustom, He added: "You love your own feelings and personal fancies more than the worth of my words. This is the reason why I love Arjun more, and even he has only recently begun to understand the importance of carrying out my orders."

In July 1925, Arjun was made the school superintendent at the Hazrat Babajan School at Meherabad and was given the duty of improving the students' conduct in class. He was among five men specifically authorized to speak with Meher Baba during designated times each day.

On 6 October 1922, Baba, in an ill-tempered mood, scolded Arjun for not finishing a vegetable dish and uttered: "Your family will perish by plague!" The next day, a telegram arrived from Poona confirming that Arjun's nephew had died from the plague. Arjun's wife had died earlier; he had not expressed much sorrow at her passing and, following Baba's instructions, had not even asked to go home for her funeral, but his nephew's death affected him greatly.

Arjun Dagdu Supekar passed away at Lonavla on 22 December 1926, only 31 years old and the father of a newborn son, his health having steadily declined since the ghost encounter. His life stands as a remarkable example of complete obedience and love for the Master.