וַיָּבֹ֗אוּ אֶֽל־הַמָּקוֹם֮ אֲשֶׁ֣ר אָֽמַר־ל֣וֹ הָאֱלֹהִים֒ וַיִּ֨בֶן שָׁ֤ם אַבְרָהָם֙ אֶת־הַמִּזְבֵּ֔חַ וַֽיַּעֲרֹ֖ךְ אֶת־הָעֵצִ֑ים וַֽיַּעֲקֹד֙ אֶת־יִצְחָ֣ק בְּנ֔וֹ וַיָּ֤שֶׂם אֹתוֹ֙ עַל־הַמִּזְבֵּ֔חַ מִמַּ֖עַל לָעֵצִֽים׃
Y como llegaron al lugar que Dios le había dicho, edificó allí Abraham un altar, y compuso la leña, y ató á Isaac su hijo, y púsole en el altar sobre la leña.
Haamek Davar
Sacrifice him as a burnt-offering: See what I wrote later on verse 9 (Haamek Davar on Genesis 22:9) in explanation of the word, "there," as it appears to be superfluous.
Rashi
את שבעת המזבחות — “Seven altars I have set in order” is not written here, but “THE SEVEN ALTARS”. He said to Him: The ancestors of these people together built before Thee seven altars, but I alone have built altars equal to all of them. — Abraham built four: (Genesis 12:7) “And he built there an altar to the Lord who had appeared to him”; (Genesis 12:8) “And he removed thence unto the mount… [and he built there an altar]; (Genesis 13:18) “And Abraham moved his tent … [and built there an altar]”; and one he built on Mount Moriah (Genesis 22:9). Isaac built one: (Genesis 26:25) “And he built there an altar”. Jacob built two, one at Shechem and one at Bethel (Genesis 33:20 and Genesis 35:7);
Rashbam
נקוד, I believe that this describes these spots in the region of the neck and head, as the word ויקוד means bending down with one’s head and neck. (Exodus 34,8) The word ויקוד has a dagesh in the letter ק, as on that occasion Moses’ bowing down was equivalent to his prostrating himself, i.e. more than just bowing down. The word is of the category of נפל, which in a similar construction would also be ויפול with the dagesh inn the letter פ. The קדקד is the head, but is also connected to the foot, as the line ויעקוד את יצחק means that he bound Yitzchok’s feet. (Genesis 22,9).