Responsa for Eruvin 81:1

וכן ערב תשעה באב שחל להיות בשבת אוכל ושותה כל צרכו ומעלה על שולחנו אפילו כסעודת שלמה בשעתו חל להיות תשעה באב בערב שבת מביאין לו כביצה ואוכל כדי שלא יכנס לשבת כשהוא מעונה

and, similarly, if the eve of the Ninth of Ab<span class="x" onmousemove="('comment',' The eve of the fast, if it falls on an ordinary day, is also subject to certain restrictions. At the last meal of the day it is forbidden to eat more than one cooked dish nor is it permitted to drink wine or eat meat on that day.');">¹</span> fell on a Sabbath a man may eat and drink as much as he requires and lay on his table a meal as big as that of Solomon in his time. If the Ninth of Ab fell on the Sabbath eve [food] of the size of an egg must be brought and eaten [before the conclusion of the day] so that one does not approach the Sabbath in a state of affliction'.<span class="x" onmousemove="('comment',' Ta'an 29b.');">²</span> It was taught:<span class="x" onmousemove="('comment',' Wanting in MS.M. Ban reads 'and it was taught'.');">³</span>

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