What is the proper Islamic method for slaughtering calves, sheep, chickens, and other permissible animals, and what are the tools used, with a detailed explanation regarding: facing the slaughtered animal towards the Qibla, the tool used and its conditions, cutting the two jugular veins along with the neck, is it permissible to cut the animal's neck with the slaughtering knife more than twice, is there a religious text for cutting the white spinal cord connected to the neck to hasten the exit of the soul, and is it permissible to cut the two jugular veins again if they become blocked after slaughter?

Lawful slaughter (Dhabh Shari) is the slaughtering or sacrificing of a permissible land animal by cutting its windpipe and esophagus, or by incapacitating a wild, uncatchable animal anywhere on its body. This act requires conditions for the slaughterer: being of sound mind, discerning, adhering to a heavenly religion, having the intention, invoking Allah's name (Tasmiyah), and not being in a state of ihram for hunting. It also requires conditions for the instrument: it must be sharp and cut by its edge, not by its weight, and not be a tooth or a nail. Furthermore, there are conditions for the slaughtered animal: it must be among those permissible to eat, have its four jugular veins (or three of them) severed, be alive at the time of slaughter, and its death must be solely due to the slaughter. It is recommended for both the slaughterer and the animal to face the Qiblah.