Reference for Menachot 166:9
<br><br><big><strong>הדרן עלך התודה היתה באה</strong></big><br><br>
and a third for that which has not passed the age of one year and whose time [for offering] has not passed.<span class="x" onmousemove="('comment',' I.e., the lamb was set apart for a Passover-offering but was slaughtered before the Passover.');"><sup>17</sup></span> And all [three texts] are necessary; for had [Scripture] taught us it only of that [Passover-offering] which had passed the age of one year and whose time [for offering] had also passed, I would have said that it was so<span class="x" onmousemove="('comment',' That it is offered as a peace-offering.');"><sup>18</sup></span> only in that case seeing that it was absolutely rejected [from being offered as a Passover-offering], but I would not have said so of that [Passover-offering] whose time [for offering] had passed but which had not passed the age of one year, since it is fit for the Second Passover.<span class="x" onmousemove="('comment',' Observed on the fourteenth day of the second month (Iyar) by those who were prevented from keeping the first Passover either by reason of uncleanness or absence on a journey; v. Num. IX, 10ff.');"><sup>19</sup></span>