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An answer on this question suggests that if a boy fathers a child before he is bar mitzvah (which is physically possible), then he fulfills p'ru ur'vu even though he wasn't yet commanded. Is that a general principle? I am particularly asking about the "once in your life" mitzvot, not the things you do regularly so there will be plenty more opportunities later.

Suppose a minor writes a sefer torah (by donating money he earned to help pay for one), and this is the only time in his life that he does so. Or, suppose that minor fathers two children before bar mitzvah and no more. Are these people yotzei? Does an action performed before you were obligated filfill what you will later be obligated in?

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If the answer turns out to be "yes, he's yotzei", then I may have a followup question about geirim that I'll ask separately. –  Monica Cellio Dec 9 '13 at 15:49
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This is likely a case-by-case situation depending if the obligation is to perform the action or have the result accomplished. –  Double AA Dec 9 '13 at 16:37
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@DoubleAA what are examples of "have the result accomplished" mitzvot? I think of mitzvot as things you need to do (or not do), not states you need to end up in, but maybe I'm missing something obvious. –  Monica Cellio Dec 9 '13 at 16:40
    
I can't think of a good undebated example off hand, but we can ask it about nearly every mitzva. If I eat and am satiated then vomit, must I still bentch? Alternatively, if I eat some bread, bentch, and then eat a small amount of some more food so that now I'm satiated, must I bentch again? Pru urvu would seem to be an excellent case to ask this. Does the man fulfill his obligation if he was drunk/sleeping/insane when the child was conceived? Alternatively, what if he has a child but it dies? –  Double AA Dec 9 '13 at 17:46
    
@DoubleAA thanks for your comments. I'm trying to ask the general philosophy question, and specifically about being obligated in mitzvot in general, versus the more situational cases like whether you're hungry or whatever. If someone who is not yet obligated because he's not technically commanded yet does something, does it count for him? If the rule is "that depends" then that could be an answer (especially if it depends on particular factors). If you can think of a better way to phrase the question, I'd welcome the help. –  Monica Cellio Dec 9 '13 at 20:00
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