Genesis 22:6

המאכלת — means a knife. It is called מאכלת from אכל to eat, because it devours the meat, — just as you say, (Deuteronomy 32:42 “And my sword shall devour (תאכל) flesh”— or because it makes animal flesh fit for eating (מאכלת) (by killing the animal; because while the animal is living its flesh is unfit for eating). Another explanation: זאת נקראת This knife is called מאכלת (and the term is never used of an ordinary knife) because Israel still eats of the reward given for it (Genesis Rabbah 56:3). וילכו שניהם יחדיו AND THEY WENT BOTH OF THEM TOGETHER — Abraham who was aware that he was going to slay his son walked along with the same willingness and joy as Isaac who had no idea of the matter.

וַיִּקַּ֨ח אַבְרָהָ֜ם אֶת־עֲצֵ֣י הָעֹלָ֗ה וַיָּ֙שֶׂם֙ עַל־יִצְחָ֣ק בְּנ֔וֹ וַיִּקַּ֣ח בְּיָד֔וֹ אֶת־הָאֵ֖שׁ וְאֶת־הַֽמַּאֲכֶ֑לֶת וַיֵּלְכ֥וּ שְׁנֵיהֶ֖ם יַחְדָּֽו׃

And Avraham took the wood of the burnt offering, and laid it upon Yiżĥaq his son; and he took the fire in his hand, and the knife; and they went both of them together.