[Abraham said to Sarah]: Say, I pray thee , thou art my sister: that it may be well with me for thy sake; and my soul
shall live because of thee. -- Genesis 12:13
Abraham said of Sarah his wife, She is my sister: and Abimelech king of Gerar sent, and
took Sarah. -- Genesis 20:2
And the men of the place asked him [Isaac] of his wife [Rebekah] ; and he said, She is my sister:
for he feared to say, She is my wife; lest, said he, the men of the place
should kill me for Rebekah; because she was fair to look upon. --
Genesis 26:7
Lying is OK if the lying is directed towards God's enemies (non-JWs). This is called the Theocratic War Strategy.