Reference for Pesachim 24:8

ורבא אליבא דר' יהודה דאמר אדם טועה ג' שעות חסר משהו מתחילת ד' לא ניכול ה' חמה במזרח ושבע חמה במערב וכל שכן ד' אי הכי בה' נמי ניכול

But Raba said: Now this is R'Judah's reason, but R'Judah follows his opinion. for he maintains, There is no removal of leaven save by burning; the Rabbis therefore gave him one hour in which to collect fuel.<span class="x" onmousemove="('comment',' Hence the fifth hour is kept in suspense, for if one were permitted to eat then he might forget about collecting fuel.');">¹⁰</span>

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