Berachos6: 5
בֵּרַךְ עַל הַיַּיִן שֶׁלִּפְנֵי הַמָּזוֹן — פָּטַר אֶת הַיַּיִן שֶׁלְּאַחַר הַמָּזוֹן. בֵּרַךְ עַל הַפַּרְפֶּרֶת שֶׁלִּפְנֵי הַמָּזוֹן — פָּטַר אֶת הַפַּרְפֶּרֶת שֶׁלְּאַחַר הַמָּזוֹן. בֵּרַךְ עַל הַפַּת — פָּטַר אֶת הַפַּרְפֶּרֶת; עַל הַפַּרְפֶּרֶת — לֹא פָטַר אֶת הַפַּת. בֵּית שַׁמַּאי אוֹמְרִים: אַף לֹא מַעֲשֵׂה קְדֵרָה.
[If] one recited a blessing on the wine which precedes the meal, he has discharged [his obligation for] the wine which follows the meal. [If] one recited a blessing over the parperes which precedes the meal, he has dis-charged [his obligation for] the parperes which follows the meal. [If] one recited a blessing on the bread, he has discharged [his obligation for] the parperes; [but if one recited a blessing] on the parperes, he has not discharged [his obli-gation for] the bread. Beis Shammai say: [He has] not even [discharged his obligation] for porridge.