Cross reference
1 Chronicles 12:33
33 Of Zebulun, such as were able to go out in the host, who could set the battle in array, with all manner of instruments of war, fifty thousand, and who could order [the battle array, and were] not of double heart.
Psalms 12:2
2 Everyone lies to his neighbor. They speak with flattering lips, and with a double heart.
John 1:47
47 Jesus saw Nathanael coming to him, and said about him, "Behold, an Israelite indeed, in whom is no deceit!"