1 Samuel 20:26

But Saul said nothing on that day, for he thought, "{Something happened to him}. He [is] not [ceremonially] clean; surely he [is] not clean."

Leviticus 15:5

And anyone who touches his bed must wash his garments and shall wash [himself] with water, and he shall be unclean until evening.

Leviticus 11:24

And by these you shall become unclean--anyone who touches their dead body shall become unclean until the evening,

Leviticus 11:27

And anything that walks upon its paws among any of the animals that walks on [all] fours--they [are] unclean for you; anyone who touches their dead body shall become unclean until the evening,

Leviticus 7:20-21

And the person who eats meat from the fellowship offerings' sacrifice, which [is] for Yahweh, and whose uncleanness [is] upon him--that person shall be cut off from his people.

Leviticus 11:31

These [are] the unclean for you among all the swarmers; anyone who touches them at their death shall become unclean until the evening.

Leviticus 11:40

And the one who eats {some of} its dead body must wash his garments, and he shall be unclean until the evening; and the one who carries its dead body must wash his garments, and he shall be unclean until the evening.

Leviticus 15:16-17

" 'And if an emission of semen goes out from anyone, then he shall wash all of his body with water, and he shall be unclean until the evening.

Leviticus 15:19-21

" 'And when a woman {is menstruating}, her body fluid discharge occurs in her body; for seven days she shall be in her menstruation, and any person who touches her shall become unclean until the evening.

Numbers 19:16

Anyone {in the open field} who touches {one who has been slain}, or a corpse, or a bone of a person, or a burial site, he will be unclean for seven days.

1 Samuel 16:5

He said, "[I come in] peace. I have come to sacrifice to Yahweh. Sanctify yourselves and come with me to the sacrifice." So he sanctified Jesse and his sons and invited them to the sacrifice.

Treasury of Scripture Knowledge

Summary

Nevertheless Saul spake not any thing that day: for he thought, Something hath befallen him, he is not clean; surely he is not clean.

Bible References

He is not clean

Leviticus 7:21
And when a person touches anything unclean, [whether] human uncleanness or an unclean animal or any unclean detestable thing, and he eats from the meat of the fellowship offerings' sacrifice, which [is] for Yahweh, then that person shall be cut off from his people.'"
Leviticus 11:24
And by these you shall become unclean--anyone who touches their dead body shall become unclean until the evening,
Leviticus 15:5
And anyone who touches his bed must wash his garments and shall wash [himself] with water, and he shall be unclean until evening.
Numbers 19:16
Anyone {in the open field} who touches {one who has been slain}, or a corpse, or a bone of a person, or a burial site, he will be unclean for seven days.