Responsa zu Jeschijahu 63:16
כִּֽי־אַתָּ֣ה אָבִ֔ינוּ כִּ֤י אַבְרָהָם֙ לֹ֣א יְדָעָ֔נוּ וְיִשְׂרָאֵ֖ל לֹ֣א יַכִּירָ֑נוּ אַתָּ֤ה יְהוָה֙ אָבִ֔ינוּ גֹּאֲלֵ֥נוּ מֵֽעוֹלָ֖ם שְׁמֶֽךָ׃
Du bist ja unser Vater, denn Abraham weiß nicht von uns, und Israel kennt uns nicht; du, o Herr, bist unser Vater, unser Erlöser ist von Ewigkeit her dein Name.
Shut min haShamayim
They answered:"Reason is not with the aged, and counsel is not with the young." (Shabbat 89b:4) "For Abraham knows us not, Israel does not recognise us" (Isaiah 63:16), rather "my covenant will be made with Isaac." (Genesis 17:21), "I have singled him out," (Isaiah 51:2) "and will give him the birthright," (Psalms 89:28) "and he shall be blessed." (Genesis 27:33)*These verses seem to support Isaac, i.e, R. Isaac Alfasi, over the Abraham and Jacob, perhaps referring to Rabbeinu Tam.
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