Exodus 12:1-7
The Institution of the Passover
12:1 The Lord said to Moses and Aaron in the land of Egypt,
12:2 “This month is to be your beginning of months; it will be your first month of the year.
12:3 Tell the whole community of Israel, ‘In the tenth day of this month they each must take a lamb for themselves according to their families – a lamb for each household.
12:4 If any household is too small for a lamb, the man and his next-door neighbor are to take a lamb according to the number of people – you will make your count for the lamb according to how much each one can eat.
12:5 Your lamb must be perfect, a male, one year old; you may take it from the sheep or from the goats.
12:6 You must care for it until the fourteenth day of this month, and then the whole community of Israel will kill it around sundown.
12:7 They will take some of the blood and put it on the two side posts and top of the doorframe of the houses where they will eat it.