Reference for Pesachim 12:1

שהרי משה עומד בפסח ראשון ומזהיר על הפסח שני שנאמר (במדבר ט, ב) ויעשו בני ישראל את הפסח במועדו וכתיב (במדבר ט, ו) ויהי אנשים אשר היו טמאים לנפש אדם

Because lo! Moses was standing on the First Passover and giving instructions about the Second Passover,<span class="x" onmousemove="('comment',' I.e., the Passover celebrated on the fourteenth of the second month by those who were unable to celebrate it at the proper time.');">¹</span> as it is said, Moreover, let the children of Israel keep the passover in its appointed season;<span class="x" onmousemove="('comment',' Num. IX, 2.');">²</span>

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