Cross reference
Leviticus 15:4
4 Every bed on which he has been resting will be unclean, and everything on which he has been seated will be unclean.
1 Corinthians 15:33
33 Do not be tricked by false words: evil company does damage to good behaviour.
Ephesians 5:11
11 And have no company with the works of the dark, which give no fruit, but make their true quality clear;
Titus 1:15
15 To the clean in heart all things are clean: but to those who are unclean and without faith nothing is clean; they become unclean in mind and in thought.