Yoreh Deah Siman 23 Seif 3

 

ג

שָׁחַט מְעַט וְשָׁהָה מְעַט, וְחָזַר וְשָׁחַט מְעַט וְשָׁהָה מְעַט, אִם כְּשֶׁתִּצְטָרֵף כָּל הַשְּׁהִיּוֹת יֵשׁ שִׁעוּר שְׁהִיָּה, שְׁחִיטָתוֹ פְּסוּלָה.

 

Seif 3

 

If a slaughterer who slaughters a little (of the neck) and then pauses a little and returns and slaughters a little and pauses a little. If when all of the pauses are combined they measure “shehiyah” (the amount of time it would take to lift up the animal, cause it to lie down) his slaughter is not acceptable..