If Guru Har Rai on one side was advising the people to meditate on the name of God, on the other side he also opened a hospital to keep his Sikhs healthy and free from diseases. He was purifying both soul and body on his Sikhs. He appointed experienced physicians in his hospital. According to the advice of the physician, he had kept all types of medicines available at the time. The treatment was given to all without any discrimination. He also got prepared rare medicines, which were not available in other part of the country.
Historian write that king Shahjahan loved his elder son Dara Sakoh very much. But his younger son Aurangzeb was feeling jealous of it. One day with help of a cook he mixed the moustache of a lion in the food of Dara Shakoh. When Dara Shakoh took that food he feel ill. He was suffering from severe pain in the stomach.
When Shahjahan heared about the suffering of Dara Shakoh he sent for all the experienced physicians working in the royal hospitals. They tried their best but were unable to relieve Dara Shakoh from the severe pain. At last the physicians said, “This medicine which can cure Dara Shakoh of this disease lies in the hospital of Guru Har Rai. Please bring the medicine as early as possible. The condition of Dara Shakoh is very critical .” But Shahjahan was hesitant to bring medicine from Guru Har Rai. He said,”How the Guru will give the medicine. I have send my army many times to annihilate them. On the other hand I am a king of India and he is Darvesh. My dignity does not allow it.”
Pir Hasan Ali and Shekh Abu Gangohi advice him that there was no discrimination in the house of Guru Nanak. There are all equal. Thay love Hindus and Muslims alike. The people of all castes get treatment in his hospital. The hermits keep eamity with none. They are friends of all.”
Then Shahjahan wrote a letter to Guru Har Rai. This letter he handed over to his trusted coutrtiers Aakal Khan and Gul Beg and sent them to Kiratpur to meet the Guru. These courtiers took two fast running horses and next day reached Kiratpur.
When the Guru heard about their mission, he welcomed them and asked his Sikhs to serve them meals and fruits. On seeing the grandeur of the Guru, they were very influenced. They were pleased to see the tradition of common kitchen.
The Guru called his physicians and ordered them to give the courtiers the required medicine. The physicians provided them the medicines and they returned back. When Dara Shakoh took that medicine he became hale and hearty within a few days. He was very influenced by the benevolence of the Guru. He made up his mind to visit Kiratpur. He reached Kiratpur and thanked the Guru for his kindness. He offered many valueable gifts to the Guru. The Guru blessed him and advised him to always remember God. He said, ”The Kings must be God fearing.” Dara Shakoh wrote a poem in the praise of the Guru. He was so influenced by the sermons of the Guru that he stayed for many days with the Guru. As Dara Shakoh was a very learned man, he studied the Sikh scriptures with great curiosity. He was very impressed on reading the holy hymns of the Gurus.
Later on he become a devout devotee of the Guru. During the war of succession, when he was fleeing towards Kabul, Guru Har Rai helped him to cross the river Beas.