Reference for Chagigah 13:9

וכן בדין שלא יהא שולחנך מלא ושולחן רבך ריקם א"ל בעיקר הרגל

And it is also logical that your table should not be full while your master's table is empty. He said to him, [Yes, but only] on the essential [day] of the festival [i.e. the first day].

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