After a name change, Pothi Sahib became Kartarpur Bir. There is a long story behind the change. It was kept in the house of the sixth master Guru Har Gobind. His grandson Dhir Mal wanted to become the next Guru. In order to put extra pressure, he stole Pothi Sahib. Some 30 years after the theft, followers of the ninth guru forcibly recovered it but Guru Tegh Bahadur instructed them to return the book. Throughout the 18th century, it remained in the custody of Dhir Mal's family. Once, the book fell into the shallow waters of the river Sutlej. When Dhir Mal recovered it, miraculously, no damage had been done. Dhir Mal's family was known as the Sodhis of Kartarpur. That is how it got the name Kartarpur Bir.
From obscurity, the holy Granth surfaced again in 1849. The British recovered it along with its golden stand from the custody of the Lahore Royal Court. On the application of Sodhi Sadhu Singh of Kartarpur, it was handed over to him in 1850. The Kartarpur Bir is well-preserved till date and installed for worship every month.