Verses with the word subtilty in the Old Testament (3 verses):

Genesis 27:35
And he said, Thy brother came with subtilty, and hath taken away thy blessing.

2 Kings 10:19
Now therefore call unto me all the prophets of Baal, all his servants, and all his priests; let none be wanting: for I have a great sacrifice to do to Baal; whosoever shall be wanting, he shall not live. But Jehu did it in subtilty, to the intent that he might destroy the worshippers of Baal.

Proverbs 1:4
To give subtilty to the simple, to the young man knowledge and discretion.