The Shulchan Aruch · Orach Chayim
אורח חיים ס״בOrach Chayim 62
Siman 62 of 697 in Orach Chayim — 5 se'ifim
הלכות קריאת שמעLaws of Reciting Shema· siman 62
Se’if 1א׳
אַף עַל פִּי שֶׁמִּצְוָה לְדַקְדֵּק בְּאוֹתִיּוֹתֶיהָ, קְרָאָהּ וְלֹא דִּקְדֵּק בָּהֶן, יָצָא.
[The Laws of] one who is not precise with the recitation of the Shema or did not make it heard to his [own] ears, and it contains 5 se'ifim Even though it is a mitzvah to be precise regarding the letters [of the Sh'ma], one who has recited it without being precise with them has [nonetheless] fulfilled their obligation.
Se’if 2ב׳
יָכוֹל לִקְרוֹתָהּ בְּכָל לָשׁוֹן, וְיִזָּהֵר מִדִּבְרֵי שִׁבּוּשׁ שֶׁבְּאוֹתוֹ לָשׁוֹן, וִידַקְדֵּק בּוֹ כְּמוֹ בִּלְשׁוֹן הַקֹּדֶשׁ.
One may read [the Sh'ma] in any language, and they should be careful to avoid word mispronunciations in that language, and one should be precise in it just as in Hebrew [lit. "the Holy tongue"].
Se’if 3ג׳
צָרִיךְ לְהַשְׁמִיעַ לְאָזְנוֹ מַה שֶּׁמּוֹצִיא בְּפִיו, וְאִם לֹא הִשְׁמִיעַ לְאָזְנוֹ, יָצָא, וּבִלְבַד שֶׁיּוֹצִיא בִּשְׂפָתָיו.
[When reading the Shema,] one must hear with their ears what comes out of their mouth, but if one did not hear it, they [still] fulfilled their obligation as long as they brought it out of their lips (i.e. articulated it with their mouth).
Shulchan Aruch, Orach Chayim — Torat Emet 363 edition, via Sefaria — public domain
English: Sefaria Community Translation — CC0