'Thousand' in the Bible

then those, indeed, who did gladly receive his word were baptized, and there were added on that day, as it were, three thousand souls,

and many of those hearing the word did believe, and the number of the men became, as it were, five thousand.

art not thou, then, the Egyptian who before these days made an uprising, and did lead into the desert the four thousand men of the assassins?'