Question: This should be an easy one if you have a Bible handy:

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> My name is Kether Torah,  
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>  the Crown of the Torah.
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> I am a pillar of righteousness,  
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>  and a foundation of mercy.
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> I am four, and three, and two, and one;  
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>  and beside me there is none other.
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> Those who hear me have life;  
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>  they that disobey me shall surely die.
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What am I?

Answer: 
Are you the:

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>  10 Commandments
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Explanation:

My name is Kether Torah,
the Crown of the Torah.

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>  This refers to the fact that we are looking into something from Judaism (probably the first 5 books of the Bible)
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I am a pillar of righteousness,

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>  We are looking for something pertaining to morality - could be quite symbolic.
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and a foundation stone of mercy.

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>  Foundation makes me think of "stone"... i.e. a tablet perhaps.
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I am four, and three, and two, and one;

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>  SURELY some numerical trick. Possibly pointing to a passage. But I notice the sum is 10, and product is 24.
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and beside me there is none other.

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>  This is said by God in the 10 commandments (the first).
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Those who hear me have life;
those who disobey me shall surely die.

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>  God says this kind of thing frequently according to the Bible. Always with regards to a threat for disobedience to a command/law.
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The evidence for guessing the Ark of the Covenant or the Ten Commandments is strong enough.

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`Regarding the Kether Torah:`
Courtesy of OP:

> 
>  ![Ten Commandments](https://i.stack.imgur.com/5wErm.jpg)
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>  [Picture of the **Ten Commandments** with the words כתר תורה (*Kether Torah*) written prominently above.]
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>  The identification of the Ten Commandments with the **Crown of the Torah** comes from the ancient Jewish practice of [gematria](http://en.wikipedia.org/wiki/Gematria), whereby the numerical value of the words *Kether Torah* is equal to that of *Aseret Ha-Devarim* ("the Ten Commandments").
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>  Headstone?  
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>  Some jewish people believe a good name is what is superior, "one crown of the torah" which a headstone has inscribed  
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> a pillar of righteousness as we honor those who fall before us and mercy on their deaths.  
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>  an equestrian headstone has meanings depending on how many legs (4) it has touching the ground.  
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> there is none other that is the same as each is different inscriptions and no one is beside as they are deceased  
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> those who keep them have life as there not planted yet or not sold  
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>  if you violate your "head" you shall surely die.
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>