Responsa zu Jeschijahu 51:2
הַבִּ֙יטוּ֙ אֶל־אַבְרָהָ֣ם אֲבִיכֶ֔ם וְאֶל־שָׂרָ֖ה תְּחוֹלֶלְכֶ֑ם כִּי־אֶחָ֣ד קְרָאתִ֔יו וַאֲבָרְכֵ֖הוּ וְאַרְבֵּֽהוּ׃ (ס)
Schauet auf Abraham, euren Vater, und auf Sara, die euch geboren! Denn als Einen habe ich ihn herbeigerufen, dass ich ihn segne und vermehre.
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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