Reference for Moed Katan 39:6

ת"ר קיים כפיית המטה שלשה ימים קודם הרגל אינו צריך לכפותה אחר הרגל דברי רבי אליעזר וחכמים אומרים אפי' יום אחד ואפי' שעה אחת

Our Rabbis taught: 'If one carried out the rule of overturning the couch<span class="x" onmousemove="('comment',' Cf. supra p. 92.');">⁹</span> for three days before the festival, he need not overturn it [any more] after the festival; these are the words of R'Eliezer; but the Sages say: [He need not] even if he had [done so] only for one day or even for one hour. Said R'Simeon B'Eleazar, Those were the very words of Beth Shammai and the very words of Beth Hillel: for Beth Shammai say: 'For three days [before the festival]', and the Hillelites Say: Even [if] for one day'.

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