Leviticus 7:21 gives the law Saul assumes: uncleanness bars one from eating the peace offering, explaining David's absence.

Leviticus 15:16 covers uncleanness from an emission of semen — another possible reason for David's absence.

Leviticus 11:24 lists uncleanness from touching a carcass — one possible source for Saul's assumption about David.

Leviticus 11:27 adds uncleanness from touching pawed animal carcasses — another possible reason for David's supposed impurity.

Leviticus 11:31 covers uncleanness from touching swarming creatures — another specific law behind Saul's reasoning.

Leviticus 11:40 addresses uncleanness from eating or carrying a carcass — another potential cause for David's ceremonial impurity.

Leviticus 15:5 describes uncleanness from touching a man with a discharge — another law Saul might have in mind.