Following are a number of back-translations as well as a sample translation for translators of 1 Chronicles 23:31:

• Kupsabiny: “Others helped the priests when the sacrifices that were burned completely on the day of Sabbath were presented to God, or/and when the month was new, or during any festival that had been appointed/set. It was decided/regulated how many were the Levites who went to do the work on each day before God should act.” (Source: Kupsabiny Back Translation)
• Newari: “On the LORD’s day of rest, at the time of the new moon family festival, and at the times of other agreed upon festivals, having been chosen according to the law, it was the responsibility of the Levites to offer burnt offerings every day.” (Source: Newari Back Translation)
• Hiligaynon: “They were also the ones-who-would-help to offer to the LORD the burnt offerings on the Day/ (plur.) of Rest, on the New/[lit. Beginning] Moon Feast, and on some other feasts. There were rules how many Levites would-do this work and how they would-do them.” (Source: Hiligaynon Back Translation)
• English: “And they were to do the same thing whenever offerings that were to be completely burned on the altar were presented/offered to Yahweh on Sabbath days and during the new moon celebrations and other religious festivals. They were told how many of them should be there and what they should do each time.” (Source: Translation for Translators)