Contradiction with Numbers 4:2-3
Numbers describes the age range for the Levites' service as 30 to 50 years old, while 1 Chronicles 23:4 mentions David setting the age at 20.
Numbers 4:2-3: Take the sum of the sons of Kohath from among the sons of Levi, after their families, by the house of their fathers,
Contradiction with Numbers 8:24-25
This passage states that the Levites should serve from age 25 to 50, differing from the age set in 1 Chronicles 23:4.
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]
Paradox #1
1 Chronicles 23:4 mentions that there are 24,000 Levites assigned for work. However, some other passages in the Old Testament might list different numbers for those assigned to similar tasks, which can create numerical conflicts or inconsistencies in the eyes of some readers trying to reconcile these figures.