וְשׁ֨וֹר וָאַ֜יִל לִשְׁלָמִ֗ים לִזְבֹּ֙חַ֙ לִפְנֵ֣י יְהוָ֔ה וּמִנְחָ֖ה בְּלוּלָ֣ה בַשָּׁ֑מֶן כִּ֣י הַיּ֔וֹם יְהוָ֖ה נִרְאָ֥ה אֲלֵיכֶֽם׃
Wołu téż i barana - na ofiary opłatne, dla ofiarowania przed obliczem Wiekuistego, i ofiarę śniedną zaczynioną oliwą; albowiem dziś Wiekuisty ukaże się wam."
Rashi
כי היום ה' נראה אליכם FOR TODAY THE LORD WILL APPEAR UNTO YOU to make His Shechinah rest upon your handiwork; on this account these sacrifices come (are to be brought) as an obligation for this day (cf. Sifra, Shemini, Mechilta d'Miluim 2 4).
Rashbam
כי היום ה' נראה, and the fire will emerge from heaven to consume the sacrifices on the altar.
Sforno
כי היום ה' נראה אליכם, it had already become manifest as an appreciation of their handiwork when we read that the Presence (glory) of the Lord filled the Tabernacle (Exodus 40,34). It is therefore no more than appropriate that you express your appreciation of this by this sacrifice.