Boxing great Zab Judah was just ordered to spend the next MONTH in jail -- after a Vegas judge determined his recent domestic violence arrest violated his probation from a DUI conviction.
TMZ Sports broke the story ... the 39-year-old former 4-time world champ was arrested for domestic violence back in July after he allegedly roughed up his wife after a night of boozing.
Problem is ... Judah was on probation at the time stemming from a 2014 DUI arrest -- and one of the terms was to stay out of trouble.
Judah appeared at a hearing in Las Vegas on Thursday and the judge determined Judah violated his probation -- and ordered the bailiff to take him into custody immediately.
According to jail records, Judah's release date has been set for Dec. 7th -- a day that will live in infamy.