'Thousand' in the Bible

Those then who had accepted his word were baptised; and there were added in that day about three thousand souls.

But many of those who had heard the word believed; and the number of the men had become about five thousand.

And many of those that practised curious arts brought their books of charms and burnt them before all. And they reckoned up the prices of them, and found it fifty thousand pieces of silver.

Thou art not then that Egyptian who before these days raised a sedition and led out into the wilderness the four thousand men of the assassins?