'Certain' in the Bible

That Hanani, one of my brethren, came, he and certain men of Judah; and I asked them concerning the Jews that had escaped, which were left of the captivity, and concerning Jerusalem.

And it came to pass, when I heard these words, that I sat down and wept, and mourned certain days, and fasted, and prayed before the God of heaven,

And at Jerusalem dwelt certain of the children of Judah, and of the children of Benjamin. Of the children of Judah; Athaiah the son of Uzziah, the son of Zechariah, the son of Amariah, the son of Shephatiah, the son of Mahalaleel, of the children of Perez;

For it was the king's commandment concerning them, that a certain portion should be for the singers, due for every day.

And certain of the priests' sons with trumpets; namely, Zechariah the son of Jonathan, the son of Shemaiah, the son of Mattaniah, the son of Michaiah, the son of Zaccur, the son of Asaph:

But in all this time was not I at Jerusalem: for in the two and thirtieth year of Artaxerxes king of Babylon came I unto the king, and after certain days obtained I leave of the king:

And I contended with them, and cursed them, and smote certain of them, and plucked off their hair, and made them swear by God, saying, Ye shall not give your daughters unto their sons, nor take their daughters unto your sons, or for yourselves.