Reference for Yoma 163:2

<big><strong>גמ׳</strong></big> השתא בפני שתים מחנכין להו בפני שנה מבעיא אמר רב חסדא לא קשיא הא בחולה הא בבריא

IN ORDER THAT THEY BECOME USED TO RELIGIOUS OBSERVANCES. <big><b>GEMARA: </b></big>Since [the Mishnah has taught already that] two years before [their attaining majority] they must be trained, is it necessary to state that one must do so a year before that time? R'Hisda said: This is no difficulty: the one refers to a healthy<span class="x" onmousemove="('comment',' With a healthy child the training may be started at an earlier year than with a sick or sickly one.');">³</span>

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