1 Chronicles 12:33

Of Zebulun, such as went forth to battle, expert in war, with all instruments of war, fifty thousand, which could keep rank: they were not of double heart.

Psalm 12:2

They speak vanity every one with his neighbour: with flattering lips and with a double heart do they speak.

John 1:47

Jesus saw Nathanael coming to him, and saith of him, Behold an Israelite indeed, in whom is no guile!

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King James Version Public Domain