Central Government Act
Section 4thly(b) in The Indian Penal Code, 1860
(b) A, knowing that Z is labouring under such a disease that a blow is likely to cause his death, strikes him with the intention of causing bodily injury. Z dies in consequence of the blow. A is guilty of murder, although the blow might not have been sufficient in the ordinary course of nature to cause the death of a person in a sound state of health. But if A, not knowing that Z is labouring under any disease, gives him such a blow as would not in the ordinary course of nature kill a person in a sound state of health, here A, although he may intend to cause bodily injury, is not guilty of murder, if he did not intend to cause death, or such bodily injury as in the ordinary course of nature would cause death.