Responsa к Йешайау 63:16
כִּֽי־אַתָּ֣ה אָבִ֔ינוּ כִּ֤י אַבְרָהָם֙ לֹ֣א יְדָעָ֔נוּ וְיִשְׂרָאֵ֖ל לֹ֣א יַכִּירָ֑נוּ אַתָּ֤ה יְהוָה֙ אָבִ֔ינוּ גֹּאֲלֵ֥נוּ מֵֽעוֹלָ֖ם שְׁמֶֽךָ׃
Ибо Ты - наш Отец; ибо Авраам не знает нас, и Израиль не признает нас; Ты, Господи, наш Отец, Наш Искупитель во веки! Твоё имя.
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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