Sant Attar Singh Ji Mastuana wale did bachan to Sant Attar Singh Ji Reru Sahib that we both became saints, but Gulab Singh (Sant Isher Singh's name before amrit) will become a saint and a king.
There was never any shortage of anything at Rara sahib, or wherever Sant Isher Singh Ji went. Sant Ji had a 108 bead mala made of gold, when a poor farmer saw this he thought if I receive this I will be able to provide for my family. Reading what was on his mind, Sant Ji handed him the mala and continued walking. Wealth was present in Sant Ji's life but they remained detached from it. But actually Sant Ji was a King and Sant in their previous life too. One time they were doing Chaur Seva for Guru Maharaj (Btw Sant Ji often referred to SGGS Ji as Guru Maharaj). Another mahapurkh said to the sangat "raise your hand if you wish to have darshan of Raja Janak". Some raised their hands and the mahapurkh pointed at Sant Isher Singh Ji saying "this is Raja Janak Ji". Raja Janak was a great saint of their time, you are probably familiar with the sakhi of them ordering Dharam Raj to free everyone from hell as they couldn't bare to hear the screams.
The young son of a family living in Delhi had an accident resulting in serious brain damage. The doctors said praying to God is your best hope. The parents left immediately for Rara Sahib and it was late night when they arrived. Their request to meet Sant Ji immediately was refused and they were given a room for the night to meet in the morning. After hearing their grievance, Sant Ji just did one bachan, "stop crying and keep faith in Guru Nanak. Now return immediately to your son". When the parents arrived at the hospital their son jumped off the bed hugged them and said "where have you been? I was waiting for you". The son's body was perfect.
Sant Ji was athaa shakti de maalak, but also most humble. They ordered their driver to stop the car saying "there's a mahapurkh". Sant Ji got out the car to greet a very gupt mahapurkh. Their name was Baba Uttar Dev Ji, they walked around with just a sack tied around the waist, very few people knew they were a bharam giani. Sant Ji bowed down and were asked "Isher Singh are you just wearing a white chola or are you white from inside too?" Sant Ji put their hands together and said "I'm trying to become white from inside". Baba Ji hugged them and said "I was joking I know you are white inside".
Sant Gurbachan Singh Ji once visited Rara Sahib and became occupied answering questions for the Singh's of Rara Sahib. Sant Isher Singh Ji quietly began dusting off the shoes of Sant Gurbachan Singh Ji with their pala (scarf). Sant Gurbachan Singh Ji immediately got up and pulled Sant Isher Singh up from the arms and said "what are you doing?" Sant Ji replied "Gursikha Ki Har Dhoor De Hum Paapi Bhi Gaat Paahein".
Sant Ji once visited a poor village where the houses were made of straw. The sangat said in the hot weather our houses burn down but we can't afford anything more permanent. Sant Ji told the village to collectively do regular kirtan as one sangat. They said if you do this your straw houses will turn into mansions. And so the village became wealthy.
Some Kirtan Singh's remember their whole life 'at this gurdwara I sung this shabad'. Before starting kirtan Sant Ji would go into their dhiyaan to focus on Vaheguru and eliminate ego from the mind. After doing kirtan Sant Ji wouldn't even remember what kirtan they did or what sakhi they told. Kirtan for them was their bhagati. In fact some people would see 2 bodies of Sant Ji at the same time. One performing kirtan and the other sitting in Sangat as a listener.
Sorry for the long reply. My hands will get tired typing, and your eyes tired reading, but still we won't find any limit to the greatness of His Holiness Sant Isher Singh Ji Maharaj