Contradiction with Numbers 3:15
Numbers 4:47 speaks about Levites ages 30 to 50 for service, but Numbers 3:15 counts all males from a month old and upward, showing a discrepancy in age focus.
Numbers 3:15: Number the children of Levi after the house of their fathers, by their families: every male from a month old and upward shalt thou number them.
Contradiction with Numbers 8:24-25
Numbers 4:47 specifies the service age as 30 to 50, while Numbers 8:24-25 mentions 25 years old as the beginning service age, creating a contradiction in the starting age.
Numbers 8:24-25: This [is it] that [belongeth] unto the Levites: from twenty and five years old and upward they shall go in to wait upon the service of the tabernacle of the congregation: [to...: Heb. to war the warfare of, etc]
Contradiction with 1 Chronicles 23:24-27
This verse indicates Levites began duties at age 20, contrasting with the age range of 30 to 50 listed in Numbers 4:47.
1 Chronicles 23:24-27: These [were] the sons of Levi after the house of their fathers; [even] the chief of the fathers, as they were counted by number of names by their polls, that did the work for the service of the house of the LORD, from the age of twenty years and upward.