Reference for Rosh Hashanah 58:3

ת"ר לא יפרוס אדם פרוסה לאורחין אלא אם כן אוכל עמהם אבל פורס הוא לבניו ולבני ביתו כדי לחנכן במצות ובהלל ובמגילה אף על פי שיצא מוציא:

for visitors unless he eats with them, but he may break bread for his children and the members of his household so as to train them in the performance of religious duties. In the reciting of [the blessing over] Hallel and the Megillah, even though he has already performed [the duty] for himself, he may perform it for others.

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