MULA was, according to a tradition recorded by Bhai Santokh Singh, Sri Gur Ndnak Prakash, a resident of Sialkot who became a devotee of Guru Nanak. As Guru Nanak once visited the city, he sent Mardana to purchase one pice worth of truth and one pice worth of falsehood. Mardana went from shop to shop, but his strange quest mystified everyone.

There was however one shopkeeper, Mula, who wrote out for him on a piece of paper: “Death is the truth: living falsehood.” Mula`s curiosity led him to follow Mardana. He fell contentment in the Guru`s presence and became a disciple. He accompanied the Guru on part of his travels before he bade him to return and rejoin his family.

References :

1. Santokh Singh, Bhai, Sri Gur Pratap Suraj Granth. Amritsar, 1927-35
2. Gian Singh, Giani, Twarikh Guru Khalas [Reprint]. Patiala, 1970
3. Macauliffe, M.A., The Sikh Religion. Oxford, 1909