'Passover sacrifice' in the Bible

And Moses calleth for all the elders of Israel, and saith unto them, 'Draw out and take for yourselves from the flock, for your families, and slaughter the passover-sacrifice;

you are to reply, ‘It is the Passover sacrifice to the Lord, for He passed over the houses of the Israelites in Egypt when He struck the Egyptians and spared our homes.’” So the people bowed down and worshiped.