Yoreh Deah Siman 19 Seif 3

 

ג שְׁנַיִם שׁוֹחֲטִין שְׁנֵי בַּעֲלֵי חַיִּים, יָכוֹל לְבָרֵךְ הָא’ לְהוֹצִיא חֲבֵרוֹ; וְהוּא שֶׁיִּתְכַּוֵּן לָצֵאת.

 

Seif 3

(if you have) Two Slaughterers and two animals, One can make one blessing for (himself and) his friend. (if) he intended to make it himself.