Reference for Keritot 13:45

אין מכפרת דהא אמר לא תכפר רבא אמר

and separated a sacrifice, and then he apostatized but retracted afterwards, [the sacrifice may not be offered] for since it has once been rejected it remains rejected.<span class="x" onmousemove="('comment',' An apostate's sacrifice may not be offered upon the altar. In accordance with this dictum 'them that do not repent' signifies people who have apostatized between the separation of the sacrifice and its offering up.');">²⁷</span>

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