Bible Search Cross Reference 2 Chronicles 33:1. Manasseh was twelve years old when he began to reign, and he reigned fifty and five years in Jerusalem:

Numbers 35:6. And among the cities which ye shall give unto the Levites [there shall be] six cities for refuge, which ye shall appoint for the manslayer, that he may flee thither: and to them ye shall add forty and two cities.


http://qbible.com/references/2-chronicles/33-1.html