Contradiction with Numbers 4:3
This verse states that Levites were to serve from 30 to 50 years of age, whereas 1 Chronicles 23:24 sets the starting age at 20.
Numbers 4:3: From thirty years old and upward even until fifty years old, all that enter into the host, to do the work in the tabernacle of the congregation.
Contradiction with Numbers 4:47
Again, this verse indicates the age of service for the Levites to be between 30 and 50, contradicting the 20 years of age specified in 1 Chronicles 23:24.
Numbers 4:47: From thirty years old and upward even unto fifty years old, every one that came to do the service of the ministry, and the service of the burden in the tabernacle of the congregation,