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הַשּׁוֹחֵט בְּשַׁבָּת וּבְיוֹם כִּפּוּר, אַף עַל פִּי שֶׁאִלּוּ הָיָה מֵזִיד, בְּשַׁבָּת מִתְחַיֵּב בְּנַפְשׁוֹ, וְלוֹקֶה בְּיוֹם הַכִּפּוּרִים, שְׁחִיטָתוֹ כְּשֵׁרָה.
A slaughter perform on Shabbat or Yom Kippur, even if it was done intentionally, on Shabbat one forfeits his life (if he slaughters), and on Yom Kippur he receives lashes.
However what he slaughter will be permissible.