A physician, a maker of arrows, even one that hath given up the vow of Brahmacharya before it is complete, a thief, a crooked-minded man, a Brahmana that drinks, one that causeth miscarriage, one that liveth by serving in the army, and one that selleth the Vedas, when arrived as a guest, however undeserving he may be the offer of water should be regarded (by a householder) as exceedingly dear.

In plain words: Even if a guest is a doctor, an arrow-maker, a thief, a dishonest man, a drinking priest, a soldier or someone who sells the Vedas, the host should gladly offer him water. A guest deserves basic kindness, however unworthy he seems.