'Kill' in the Bible

For there were many in the assembly who had not consecrated themselves [that is, become ceremonially clean and free from all sin]; so the Levites had to slaughter the Passover lambs for everyone who was not clean, in order to make them holy for the Lord.

Slaughter the Passover lambs and consecrate yourselves, and prepare for your fellow countrymen to carry out (obey) the word of the Lord given by Moses.”