The combination of being a Thief is mentioned in the classics – out of which one of the simplest one is connection between the Lagna the the 6th Lord being involved together or in an exchange but has to be negatively placed or Jupiter needs to be in Further affliction in the chart. The deeper meaning is that such people will make wrong moral decisions in life due to which they will suffer and have to work and physically exaust themselves for relieving their debts from others for stealing in past and this life.
All professions of 6th house require immense hardwork and it eventually effect’s their health – Medical, Law, Fighting, Competitive Sports, etc – If this combination has a positive outcome and circuit then the same native will be extremely skilled and be one of the best in the field but have negative impact on other aspects in life such as Marriage and Kids. You can let me know the same in the comments.