Bhai Dayala ji (died 1675) variously spelt as Bhai Dayala, Bhai Diala, was one of the earliest martyrs to the Sikh faith. Along with his companions Bhai Mati Das and Bhai Sati Das as well as Ninth Guru, Guru Tegh Bahadur, Bhai Dayala was martyred at Chandni Chowk at Delhi in November 1675 for his refusal to barter his faith.
Bhai Dayala was one of the Sikhs who accompanied Guru Tegh Bahadur when the latter left Anandpur on 11 July 1675 to court martyrdom at Delhi, the other two were brothers—Bhai Mati Das, a Dewan and Bhai Sati Das, a Scribe at Guru’s court. Along with Ninth Guru ji, they were arrested under orders from Emperor Aurangzeb at Agra. On 9 November 1675 A.D, the Qazi pronounced his religious order that Bhai Dayala must either accept Islam or be prepared to embrace death by being boiled in a cauldron. Bhai Dayala heroically accepted the latter alternative and asked leave of the Guru. The Guru graced Bhai Dayala for his lifelong devotion as a true and dedicated Sikh and blessed him with glory and success. Bhai Dayala was put into a big cauldron full of water which was later heated to the boiling point. Bhai Dayala continued to his last breath to recite the Japjiof Guru Nanak and the Sukhmani of Guru Arjan.