What is the admissible evidence for proving the crime of battery in Islamic Sharia, and are the victim's statements, along with a medical report that confirms the injury but does not identify the perpetrator, sufficient, especially if the accused denies it?

If the accused denies the accusation leveled against him, the medical report alone is not sufficient to convict him. Rather, there must be evidence that proves his guilt, for the Prophet, peace and blessings be upon him, said: “Were people to be given according to their claims, then some would claim the blood and wealth of others.” Thus, evidence is a fundamental condition for establishing a claim.