1 Samuel 20:26

Nevertheless Saul didn't say anything that day: for he thought, "Something has happened to him. He is not clean. Surely he is not clean."

Leviticus 15:5

Whoever touches his bed shall wash his clothes, and bathe himself in water, and be unclean until the evening.

Leviticus 11:24

"'By these you will become unclean: whoever touches the carcass of them shall be unclean until the evening.

Leviticus 11:27

Whatever goes on its paws, among all animals that go on all fours, they are unclean to you. Whoever touches their carcass shall be unclean until the evening.

Leviticus 7:20-21

but the soul who eats of the flesh of the sacrifice of peace offerings, that belongs to Yahweh, having his uncleanness on him, that soul shall be cut off from his people.

Leviticus 11:31

These are they which are unclean to you among all that creep. Whoever touches them when they are dead, shall be unclean until the evening.

Leviticus 11:40

He who eats of its carcass shall wash his clothes, and be unclean until the evening. He also who carries its carcass shall wash his clothes, and be unclean until the evening.

Leviticus 15:16-17

"'If any man has an emission of semen, then he shall bathe all his flesh in water, and be unclean until the evening.

Leviticus 15:19-21

"'If a woman has a discharge, and her discharge in her flesh is blood, she shall be in her impurity seven days: and whoever touches her shall be unclean until the evening.

Numbers 19:16

"Whoever in the open field touches one who is slain with a sword, or a dead body, or a bone of a man, or a grave, shall be unclean seven days.

1 Samuel 16:5

He said, "Peaceably; I have come to sacrifice to Yahweh. Sanctify yourselves, and come with me to the sacrifice." He sanctified Jesse and his sons, and called 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
When anyone touches any unclean thing, the uncleanness of man, or an unclean animal, or any unclean abomination, and eats some of the flesh of the sacrifice of peace offerings, which belong to Yahweh, that soul shall be cut off from his people.'"
Leviticus 11:24
"'By these you will become unclean: whoever touches the carcass of them shall be unclean until the evening.
Leviticus 15:5
Whoever touches his bed shall wash his clothes, and bathe himself in water, and be unclean until the evening.
Numbers 19:16
"Whoever in the open field touches one who is slain with a sword, or a dead body, or a bone of a man, or a grave, shall be unclean seven days.