Reference for Moed Katan 39:9
רבינא איקלע לסורא דפרת א"ל רב חביבא לרבינא הלכתא מאי אמר ליה אפי' יום אחד ואפילו שעה אחת
Said R'Habiba to Rabina: What is the law [on this point]? - He replied: 'Even [if he had the couch overturned] one day and even for one hour'. R'Hiyya B'Abba, R'Ammi and R'Isaac were [once] seated in the marquee of R'Isaac B'Eleazar<span class="x" onmousemove="('comment',' Palestinian authorities.');"><sup>14</sup></span> when a discussion was begun between them: Whence is it authentically derived that the observance of mourning is for seven days?
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