I Maccabees 12:21

21 It is found in writing, that the Lacedemonians and Jews are brethren, and that they are of the stock of Abraham:

I Maccabees 12:21 In-Context

19 And this is the copy of the letters which Oniares sent.
20 Areus king of the Lacedemonians to Onias the high priest, greeting:
21 It is found in writing, that the Lacedemonians and Jews are brethren, and that they are of the stock of Abraham:
22 Now therefore, since this is come to our knowledge, ye shall do well to write unto us of your prosperity.
23 We do write back again to you, that your cattle and goods are our's, and our's are your's We do command therefore our ambassadors to make report unto you on this wise.

The Brenton translation of the Septuagint is in the public domain.