'Certain' in the Bible

Whenever the Israelis sowed their crops, the Midianites, the Amalekites, and certain groups from the east would come up and invade them.

Then Gideon was certain that he was the angel of the Lord; and Gideon said, I am in fear, O Lord God! for I have seen the angel of the Lord face to face.

Then all the Midianites, Amalekites, and certain groups from the east gathered together, crossed the Jordan River, and set up camp in the Jezreel Valley.

See, I will put the wool of a sheep on the grain-floor; if there is dew on the wool only, while all the earth is dry, then I will be certain that it is your purpose to give Israel salvation by my hand as you have said.

The Midianites, the Amalekites, and certain groups from the east lay encamped in the valley, as thick as locusts. The number of their camels couldn't be calculated they seemed as numerous as the sand on the seashore.

And a certain woman cast a piece of a millstone upon Abimelech's head, and all to brake his skull.

And there was a certain man of Zorah, of the family of the Danites, whose name was Manoah; and his wife was barren, and bare not.

Then Micah said, Now I am certain that the Lord will do me good, seeing that the Levite has become my priest.

And it came to pass in those days, when there was no king in Israel, that there was a certain Levite sojourning on the side of mount Ephraim, who took to him a concubine out of Bethlehemjudah.

Now as they were making their hearts merry, behold, the men of the city, certain sons of Belial, beset the house round about, and beat at the door, and spake to the master of the house, the old man, saying, Bring forth the man that came into thine house, that we may know him.