The wards - Rather, "the offices or observances." Nehemiah's arrangement is probably that described in Nehemiah 11:10-22.

Thus cleansed I them from all strangers,.... Both people and priests from strange wives, obliging them to put them away, or flee their country:
and appointing the wards of the priests and the Levites, everyone in his business: to do the work of their office in their courses and turns.

Nehemiah concludes his work with a short summary of what he had effected for the community. "I cleansed them from all strangers" (comp. Nehemiah 13:23., Nehemiah 9:2; Nehemiah 13:1.), "and appointed the services for the priests and Levites, each in his business, and for the wood-offering at times appointed (Nehemiah 10:35), and for the first-fruits" (Nehemiah 10:36.). The suffix to וטהרתּים refers to the Jews. נכר, strange, means foreign heathen customs, and chiefly marriages with heathen women, Nehemiah 13:23., Nehemiah 9:2; Nehemiah 13:1. משׁמרות העמיד, properly to set a watch, here used in the more general sense of to appoint posts of service for the priests and Levites, i.e., to arrange for the attendance upon those offices which they had to perform at their posts in the temple, according to the law; comp. Nehemiah 10:37, Nehemiah 10:39; Nehemiah 12:44-46; Nehemiah 13:13. וּלקרבּן and ולבּכּוּרים, Nehemiah 13:31, still depend on משׁמרות ואעמידה: I appointed the attendance for the delivery of the wood for the altar at appointed times (comp. Nehemiah 10:35), and for the first-fruits, i.e., for bringing into the sanctuary the heave-offering for the priests. The בּכּוּרים are named as pars pro toto, instead of all the תרוּמות prescribed by the law. On the arrangements connected with these two subjects, viz., the purification from heathen practices, and the restoration of the regular performance of divine worship, was Nehemiah's whole energy concentrated, after the fortification of Jerusalem by a wall of circumvallation had been completed. He thus earned a lasting claim to the gratitude of the congregation of his fellow-countryman that returned from Babylon, and could conclude his narrative with the prayer that God would remember him for good. On this frequently-repeated supplication (comp. Nehemiah 13:14, Nehemiah 13:22, and Nehemiah 5:19) Rambach justly remarks: magnam Nehemiae pietatem spirat. This piety is, however - as we cannot fail also to perceive - strongly pervaded by the legal spirit of post-Babylonian Judaism.