'Thousand' in the Bible

So those who accepted his message were baptized, and on that day about three thousand souls were added.

But many of those who listened to the message believed, and the number of the men was approximately five thousand.

and many of those who practiced magic brought together [their] books [and] burned [them] up in the sight of everyone. And they counted up their value and found [it was] {fifty thousand silver coins}.

Then you are not the Egyptian who before these days raised a revolt and led out into the wilderness the four thousand men of the Assassins?"