Exodus 17:14

כתב זאת זכרון WRITE THIS FOR A MEMORIAL, that Amalek came to wage war against Israel before any other nation. ושים באזני יהושע AND PUT INTO THE EARS OF JOSHUA, who will bring Israel into the Holy Land, that he must command Israel to pay him his recompense. Here it was intimated to Moses (by the mere statement that Joshua should in some future time carry out the injunction to destroy Amalek) that Joshua would bring Israel into the Holy Land (cf. (Mekhilta). כי מחה אמחה BECAUSE I WOULD UTTERLY BLOT OUT [THE REMEMBRANCE OF AMALEK] — the reason why I admonish you thus is because (כי) I desire to blot it out.

וַיֹּ֨אמֶר יְהֹוָ֜ה אֶל־מֹשֶׁ֗ה כְּתֹ֨ב זֹ֤את זִכָּרוֹן֙ בַּסֵּ֔פֶר וְשִׂ֖ים בְּאׇזְנֵ֣י יְהוֹשֻׁ֑עַ כִּֽי־מָחֹ֤ה אֶמְחֶה֙ אֶת־זֵ֣כֶר עֲמָלֵ֔ק מִתַּ֖חַת הַשָּׁמָֽיִם׃

And the Lord said to Moshe, Write this for a memorial in a book, and rehearse it in the ears of Yehoshua: that I will utterly blot out the remembrance of ῾Amaleq from under the heaven.