Contradiction with Numbers 18:21
While Numbers 18:26 discusses the Levites giving a tithe to the priests from what they receive, Numbers 18:21 states that the children of Israel give tithes to the Levites as an inheritance, not mentioning any requirement for the Levites to give a portion of this to the priests explicitly.
Numbers 18:21: And, behold, I have given the children of Levi all the tenth in Israel for an inheritance, for their service which they serve, [even] the service of the tabernacle of the congregation.
Paradox #1
Numbers 18:26 discusses the instruction for the Levites to give a portion of their received tithes as an offering to the Lord. A potential contradiction or inconsistency might arise when considering New Testament teachings, particularly in Hebrews, which suggest that Jesus is the ultimate high priest and mediator, potentially altering or fulfilling Old Testament requirements concerning priestly duties and offerings. This could raise questions about the relevance of such Old Testament practices for New Testament believers. However, it's important to note that interpretations can vary among different theological perspectives.