'Certain' in the Bible

The revelation given by Jesus Christ, which God granted Him, that He might make known to His servants certain events which must shortly come to pass: and He sent His angel and communicated it to His servant John.

I will cause some belonging to Satan's synagogue who say that they themselves are Jews, and are not, but are liars--I will make them come and fall at your feet and know for certain that I have loved you.

Here is scope for ingenuity. Let people of shrewd intelligence calculate the number of the Wild Beast; for it indicates a certain man, and his number is 666.