The Priestly Document (P) from the classic hypothesis of four documents is in fact the only one element of this hypothesis, which remained the current assumption in all modern hypotheses about the Pentateuch. The problem is that until now the researchers are unable to determine where this document in its original form (the so-called Grundschrift-P) was ending. In modern discussion, it is often limited to the Books of Genesis and Exodus. Nevertheless, the texts classified as P or post-P are also found in the Book of Leviticus and the Book of Numbers, and according to some even in the Book of Deuteronomy. The discussion of the critical-literary nature on the text in Numbers 20:1–13shows the complexity of the problem and is an example that unambiguous solutions in the source classification of a given text and explaining the process of its creation are not easy. In the latest analyses, the pericope is considered entirely as either the P or post-P text, but nevertheless more complex and multilayered models explaining the process of its formation are often proposed.