Outwardbusiness - Work done without the city; cutting of timber, hewing stones, ploughing the fields belonging to the sanctuary. - Jarchi.
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SDA Bible Commentary (limited)
29. Outward business. This external work of the Levites consisted of carrying responsibilities as “officers and judges.” According to ch.23:4, 6,000 Levites were set apart for these duties. Already in the days of Moses priests were assigned duties as judges (Deut. 17:9-12; 19:17; 21:5).