Halakhah к Шмот 12:6

The commandment to slaughter the Pesach sacrifice: To slaughter on the day of the fourteenth of Nissan in the late afternoon an unblemished one-year-old male lamb, or kid, in the Chosen House (Temple), and this is called the Pesach (Passover) sacrifice, as it is stated (Exodus 12:6), "The entire assembly of the congregation of Israel shall slaughter it in the afternoon." The content of this commandment is that all the people of Israel divide into assemblages, take from the market or from their houses an unblemished one-year-old male kid or lamb, and slaughter it in the courtyard of the Temple on the fourteenth day of Nissan in the afternoon. Afterwards in the evening, they eat it, [dividing it up] amongst themselves, after [eating their other] food; since its commandment is that it should be eaten while satiated (Pesachim 70a).