'Certain' in the Bible

Certain of them were in charge of the vessels of service; for by count were these brought in and by count were these taken out.

He appointed certain of the Levites to minister before the ark of Yahweh, and to celebrate and to thank and praise Yahweh, the God of Israel:

Then there went certain persons, and told David how the men were served. He sent to meet them; for the men were greatly ashamed. The king said, "Stay at Jericho until your beards have grown, and then return."

Moreover, David and the captains of the army set apart for the service certain of the sons of Asaph, and of Heman, and of Jeduthun, who should prophesy with harps, with stringed instruments, and with cymbals: and the number of those who did the work according to their service was: