'Certain' in the Bible

But a certain one of the bystanders, drawing [his] sword, struck the slave of the high priest and cut off his ear.

And a certain young man was following him, clothed [only] in a linen cloth on [his] naked body. And they attempted to seize him,

And they forced a certain man who was passing by, Simon of Cyrene (the father of Alexander and Rufus), who was coming from the country, to carry his cross.