New Living Translation (©2007)
They assisted with the burnt offerings that were presented to the LORD on Sabbath days, at new moon celebrations, and at all the appointed festivals. The required number of Levites served in the LORD's presence at all times, following all the procedures they had been given.

English Standard Version (©2001)
and whenever burnt offerings were offered to the LORD on Sabbaths, new moons, and feast days, according to the number required of them, regularly before the LORD.

New American Standard Bible (©1995)
and to offer all burnt offerings to the LORD, on the sabbaths, the new moons and the fixed festivals in the number set by the ordinance concerning them, continually before the LORD.

GOD'S WORD® Translation (©1995)
They were appointed to stand in front of the LORD in the required numbers whenever burnt offerings were made-on weekly worship days, at New Moon Festivals, and on appointed annual festivals.

King James Bible
And to offer all burnt sacrifices unto the LORD in the sabbaths, in the new moons, and on the set feasts, by number, according to the order commanded unto them, continually before the LORD:

American King James Version
And to offer all burnt sacrifices to the LORD in the sabbaths, in the new moons, and on the set feasts, by number, according to the order commanded to them, continually before the LORD:

American Standard Version
and to offer all burnt-offerings unto Jehovah, on the sabbaths, on the new moons, and on the set feasts, in number according to the ordinance concerning them, continually before Jehovah;

Bible in Basic English
At every offering of burned offerings to the Lord, on Sabbaths, and at the new moons, and on the regular feasts, in the number ordered by the law, at all times before the Lord;

Douay-Rheims Bible
As well in the oblation of the holocausts of the Lord, as in the sabbaths and in the new moons, and the rest of the solemnities, according to the number and ceremonies prescribed for every thing, continually before the Lord.

Darby Bible Translation
and for all burnt-offerings offered up to Jehovah on the sabbaths, on the new moons, and on the set feasts, by number, according to the ordinance concerning them, continually, before Jehovah;

English Revised Version
and to offer all burnt offerings unto the LORD, in the sabbaths, in the new moons, and on the set feast, in number according to the ordinance concerning them, continually before the LORD:

Webster's Bible Translation
And to offer all burnt-sacrifices to the LORD on the sabbaths, in the new moons, and on the set feasts, by number, according to the order commanded to them, continually before the LORD:

World English Bible
and to offer all burnt offerings to Yahweh, on the Sabbaths, on the new moons, and on the set feasts, in number according to the ordinance concerning them, continually before Yahweh;

Young's Literal Translation
and for all the burnt-offerings -- burnt-offerings to Jehovah for sabbaths, for new moons, and for appointed seasons, by number, according to the ordinance upon them continually, before Jehovah.