'Certain' in the Bible

And now, I pray you, swear to me by Jehovah, since I have dealt kindly with you, that ye will also deal kindly with my father's house, and give me a certain sign,

Be sure to keep a distance of about 2,000 cubits between you and it. Don't come near it, so you can be certain where you're going, since you haven't passed this way before."

Say to the children of Israel, Let certain towns be marked out as safe places, as I said to you by the mouth of Moses,

And Phinehas, the son of Eleazar the priest, said to the children of Reuben and the children of Gad and the children of Manasseh, Now we are certain that the Lord is among us, because you have not done this wrong against the Lord: and you have kept us from falling into the hands of the Lord.

know for certain that the Lord your God will not continue to drive these nations out before you. They will become a snare and a trap for you, a scourge for your sides and thorns in your eyes, until you disappear from this good land the Lord your God has given you.

Now I am about to go the way of all the earth: and you have seen and are certain, all of you, in your hearts and souls, that in all the good things which the Lord said about you, he has kept faith with you; everything has come true for you

But in the same way every faithful promise the Lord your God made to you has been realized, it is just as certain, if you disobey, that the Lord will bring on you every judgment until he destroys you from this good land which the Lord your God gave you.