This gurdwara marks the site graced by two Gurus. Guru HarGobind Sahib Ji and Guru Gobind Singh Ji. Guru HarGobind Sahib Ji spent a night here. A leper came to Gurji and requested him to relieve his pain. Guruji adviced him to take lather from horse's mouth and rub it on body. Then take bath in the pond. The leper did as directed by Guruji and got rid of his disease. Since then many Devotees who want to get rid of boils, pimples they take bath here. When Guru Gobind Singh Ji desguised as the Pir of Uchch and carried in a palangier, was passing by this Village, he was stopped by the Imperial mobile patrol. The commander of the patrol suspecting that the Pir might in fact be the Guru, stopped and interrogated the party. Sayyid Pir Muhammed of Nurpur, who had been Guruji's Persian tutor, testified that the personage inside the palanguin was a most exalted Pir and the party was allowed to proceed. Prakash Utsav of first, sixth and tenth Patshahis are celebrated here.

Location
Gurdwara Gurusar Sahib is situated in Village Lal Kalan 0.5 Kms. from Nilopul which is on Chandigarh-Ludhiana Road. This Village is 10 Km. west of Samrala.

Sri Guru Hargobind Sahib Ji arrived at the location of Gurdwara Sri Gurusar Sahib Lal Kalan on 19 Faghan 1675 Vikrami (1618 AD).

Guru Hargobind Sahib Ji had 7 cannons and 1100 horse riders; Chandu Qaidi (the one who was involved in Guru Arjan Sahib's martyrdom) and 52 Raja's; whom were released with Guru Hargobind wearing a special robe with 52 kalian (ribbons) attached to it.

It is said that at this place, the Raja's asked for Guru Hargobind's permission to leave and return home. Guru Hargobind told them to go and fulfill their responsibilities.

However, one Raja (Hast Lal) decided to stay and marry locally. Guru Hargobind asked the Sangat whether there was anyone that wanted his daughter to marry.

A Sikh from village Lal Kalan was ready to marry his daughter and sought permission from Guru Hargobind. Guru Hargobind Sahib performed the Anand Karj wedding personally.

After the marriage Raja Hast Lal stayed in village Bulala (3.5 km south of Lal Kalan) and was known as 'Baba Hast Lal'.

Sri Barota Sahib is present inside the Gurudwara complex, near the main gate of the Gurdwara. There was a Barota tree present when Guru Hargobind visited and Guru Ji said to Sangat, 'This tree looks like an Amb (Mango tree)'.

The Sangat said the tree was a 'Borh' tree but Guru Hargobind showed the Sangat the leaves and, indeed, the leaves were those of an Amb tree. The tree still exists.

Sri Beri Sahib, also present within the Gurdwara complex, was the tree which Guru Hargobind tied his horse. A person suffering from leprosy was staying nearby in a small house. The man asked Guru Hargobind to help cure him. Guru Hargobind told the man to put the foam from his horses mouth all over his body and take a bath in the pond (sarovar) near the Beri Sahib. After the bath, the man was cured. It is said the sarovar still helps cure skin diseases.

Sri Guru Gobind Singh Ji also arrived here on 11 Poh 1761 Vikrami (1705) along with Bhai Daya Singh, Bhai Dharam Singh, Bhai Maan Singh, Bhai Ghani Khan, Bhai Nabi Khan. Guru Gobind Singh was travelling from Machhiwara after becoming 'Unch Da Peer' and rested under the Beri Sahib.

Guru Gobind Singh continued his journey towards Gurdwara Sri Degsar Sahib (Katana Sahib).