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The biblical source for the obligation to defend oneself against an unprovoked attack is Exodus 22:1. Other English bible versions, the King James Version for example, number this verse as 22:2, but the original Hebrew for my reference use. There the bible states, "If a thief is found breaking in, and is killed, no bloodguilt is incurred."

The Talmud: Self-Defense Against an Attacker is Required:

The legal wisdom in the Talmud was written down between 200 and 500 C.E.,during the final phases of the Roman Empire, before Jewish psychology had been much distorted by the ensuing centuries of persecution. In the Talmud, generations of sages properly interpret and apply the Laws set forth in the Five Books of Moses, the Torah.

The Talmud repeatedly mandates self-defense against an attacker. For example, in Talmud Tractate Sanhedrin -- which deals with Legal Judgments - theRabbis explain Exodus 22:1, which states, "If a burglar is caught in the act of breaking in, and is struck and killed, it is not considered an act of murder." The next sentence explains, "However, if he robs in broad daylight, then it is an act of murder [to kill him]."

The first sentence clearly refers to a burglar who works at night. This burglar may be killed, presumably because he enters covertly, knowing that people could be present. He is deemed to have lethal intent. If the homeowner is being robbed by his father or anyone else where it can be correctly determined by a court of law (hence the phrase 'broad daylight' -- if it is clear as daylight that the intruder would not harm the homeowner) that the intruder would never use deadly force to commit the robbery even should the occupant offer resistance, lethal defense is not permissable. If the intruder and his intentions are in doubt, deadly force may be used by the homeowner to defend himself or herself even if the robbery occurs in broad daylight.

On this text, the Rabbis base a general proposition: "If someone comes to kill you, arise quickly and kill him." The Rabbis explain that a thief who enters a building covertly, must know that people:

are likely to be in the building;
will likely try to defend their property.
Thus, the Rabbis presume such an intruder to be ready for a confrontation. They conclude that any person confronting such a thief must be ready to use deadly force against him, if necessary. Use of such force is not required - one does not have to kill the intruder -- but one must do so if that is the only way to save one's own life.(8)





"If I am ever faced with the situation where I must take a life to save my own, I want the most state of the art equipment available to fulfill my Torah obligation -- not a two-by-four or a letter opener, thanks very much. I do not skimp on any other item required to observe the Torah's commandments. Why should I use anything other than the best to perform this Torah precept?"
unknowen

so in short if you follow the old testiment and not the new version this may also help.So Under jewish law you clearly have an obligation to defend yourself. To further this failing to do so is viewed the same as suicide.