Numbers 3:46

And for those that are to be redeemed
With money, there being not Levites enough to answer to them, and exchange for them:

of the two hundred and threescore and thirteen of the firstborn of the
children of Israel, which are more than the Levites;
for the sum total of the Levites, as given, was but 22,000, ( Numbers 3:39 ) , whereas the sum total of the firstborn of Israel were 22,273, ( Numbers 3:43 ) , so that there were, two hundred seventy three more of the latter than of the former; and what was to be done with these next follows.