Hullin or Chullin (Hebrew: חֻלִּין, romanized: ḥullin lit. "Ordinary" or "Mundane") is the third tractate of the Mishnah in the Order of Kodashim and deals with the laws of ritual slaughter of animals and birds for meat in ordinary or non-consecrated use (as opposed to sacred use), and with the Jewish dietary laws in general, such as the laws governing the prohibition of mixing of meat and dairy.
While it is included in the Order Kodashim, it mainly discusses non-consecrated things and things used as the ordinary human food, particularly meats; it is therefore sometimes called "Shehitat Hullin" ("Slaughtering of Non-Consecrated Animals"). It comprises twelve chapters, dealing with the laws for the slaughtering of animals and birds for meat for ordinary as opposed to sacred use, with other rules relating to the eating of meat, and with the dietary laws in general.[1][2][3]
The rules prescribed for kosher slaughtering, known as shechita, include five things which must be avoided: there must be no delay; no pressure may be exerted on the knife's moving backwards and forwards; the knife must not be allowed to slip beyond a certain area of throat; there must be no thrusting of the knife under the skin or between the gullet and windpipe; the gullet or windpipe must not be torn out of position in the course of slaughtering.[1]