Under old covenant law, ritual uncleanness prevented a person from participating in fellowship offerings and feasts (see Leviticus 7:20–21). There were various things that could have caused such a state of uncleanness. They are specified in detail in Leviticus 11:1 – 17:16.
26 Saül ne dit rien ce jour-là; car, pensa-t-il, c'est par hasard, il n'est pas pur, certainement il n'est pas pur.