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Then AbimelechcalledAbraham, and said to him, What has thou done to us? and in what have I offended thee, that thou hast brought on me and on my kingdom a great sin? thou hast done deeds to me that ought not to be done.
A 'thousand' means much, many, a countless number, a whole era of time, an abundance. When used in reference to the Lord, it actually means a number greater than that: In those cases it means what is infinite, what is truly without end.