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For example if someone in Islam today converted, and tomorrow they return back to any other religion, then:

Crime has been committed. And must be condemned His Actions will be punished

Is there any command about this in Judaism?

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See Rambam Melakhim 10:3 and commentaries, e.g., קונטרס הביאורים. –  wfb Feb 5 '13 at 22:33
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2 Answers

up vote 8 down vote accepted

Provided the conversion was valid, the person is considered a Jew forever. If they "revert" to something other than Judaism, they may be sinning, but that is between them and G-d now.

As far as punishment, they are no different than any other Jew. That is to say, Jewish courts today no longer have the power to punish people for sins against G-d.

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What is G-D? is that God? if so why did you write it that way? –  Hossein Feb 6 '13 at 9:49
@Hossein, welcome to Mi Yodeya! As you may notice throughout the site, spelling it that way is a common convention among many religious Jews, although is seems from here that it may not be required in Jewish law. Take it from me, though, as an English-speaking Jew, it is very common. –  Seth J Feb 6 '13 at 14:52
@Sethj:Thank you very much :) it was very informative and interesting ;) –  Hossein Feb 7 '13 at 11:00
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As HodofHod mentioned, once a person converts to Judaism, mentally and bodily, the conversion is full and effective spiritually and legally (meaning within Jewish law).

Aside from a few cases of very strict rabbinic interpretations of what is considered a "full and effective" conversion (and attempts, thereby, to retroactively invalidate a person's conversion), and different standards among different denominations, nobody disputes that once someone has effectively converted they remain Jewish, in the eyes of Jewish law, forever.

Just to add to that answer and clarify/expand a bit, there is no specific sin against "reverting", because no such thing is recognized. However, any time a convert engages in any act that is forbidden to Jews, the convert is sinning as a Jew by not upholding the commandments in the Torah - not because the convert has "reverted".

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+1 I had both of these points in mind when I wrote my answer, but you articulated them better than I did. –  HodofHod Feb 5 '13 at 22:41
@HodofHod Aww, thanks. –  Seth J Feb 5 '13 at 22:53
@HodofHod if you want i accept seth's answer? –  saber tabatabaee yazdi Feb 6 '13 at 8:26
@saber tabatabaee Yazdi that isn't necessary, as my answer was just an enhancement. I would have edited Hod's answer if I weren't concerned about making too drastic of a change. –  Seth J Feb 6 '13 at 13:27
@Saber You should accept whichever answer is most helpful to you. :) –  HodofHod Feb 6 '13 at 15:43
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