Slaughtering the Pesach sacrifice:

Exodus chapter 12;
Deuteronomy 16:1-6.

Talmud Pesachim pg. 6 'The laws of Pesach are studied and taught thirty days before the Festival.'

Mishnah Berurah (commentary on Shulkhan Arukh):

• 431-447 hamets
• 451-452 koshering utensils
• 453-462 matsah
• 468-471 day before Pesach

Kitsur Shulkhan Arukh

• 108-110 baking matsahs
• 111 searching for and burning hamets
• 113-115 the day before Pesach