<m.Berakhot 8.8>  

If wine is served to them after the food, and that is the only cup there, Beth Shammai [CE1] say that a blessing is first said over the wine and then [the grace] over the food, while Beth Hillel [CE1] Say that a blessing is first said over the food and then over the wine. One says Amen after a blessing said by an Israelite but not after a blessing said by a Cuthean, unless the whole of it has been heard.

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