Tom, I quote from the preface of the ESV:

The ESV is based on the Masoretic text of the Hebrew Bible as found in Biblia Hebraica Stuttgartensia (2nd ed 1983) and on the Greek text in the 1993 editions of the Greek New Testament published by the United Bible Societies and Novum Testamentum Graece (27th edition) edited by Nestle and Aland.

It is perhaps worth visiting www.esv.org for more detailed information.

Hope this helps

Johan

Last edited by Johan; Wed Dec 31, 2008 7:54 AM.