Midrash for Berakhot 8:7
מִי שֶׁאָכַל וְשָׁכַח וְלֹא בֵרַךְ, בֵּית שַׁמַּאי אוֹמְרִים, יַחֲזֹר לִמְקוֹמוֹ וִיבָרֵךְ. וּבֵית הִלֵּל אוֹמְרִים, יְבָרֵךְ בַּמָּקוֹם שֶׁנִּזְכָּר. עַד אֵימָתַי הוּא מְבָרֵךְ. עַד כְּדֵי שֶׁיִּתְעַכֵּל הַמָּזוֹן שֶׁבְּמֵעָיו:
If one ate and forgot to say grace, Beth Shammai say: He returns to his place and blesses; and Beth Hillel say: Until the food in his stomach is absorbed. [So long as he is not hungry because of that repast, it is a sign that the food has not yet been absorbed. And it is only in an instance of one's having forgotten, that Beth Hillel says he does not return; but, where his omission is deliberate, all agree that he returns to his place and says grace.]
Pirkei DeRabbi Eliezer
At twilight on Saturday (evening), Adam was meditating in his heart and saying: Perhaps the serpent, which deceived me, will come in the evening, and he will bruise me in the heel. A pillar of fire was sent to him to give illumination about him and to guard him from all evil. Adam saw the pillar of fire and rejoiced in his heart, and he put forth his hands to the light of the fire, and said: Blessed art Thou, O Lord our God, King of the universe, who creates the flames of fire. And when he removed his hands from the light of the fire, he said: Now I know that the holy day has been separated from the work day here below (on earth), for fire may not be kindled on the Sabbath day; and in that hour he said: Blessed art Thou, O Lord our God, King of the universe, who divides || the holy from the profane, the light from the darkness.
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