Hebrews 4:12
For the Word of God is living and powerful and sharper than any twoedged sword, piercing even to the dividing asunder of soul and spirit, and of the joints and marrow, and is a discerner of the thoughts and intents of the heart.

Revelation 2:23,29
and I will strike her children dead. And all the churches will know that I am the one who searches minds and hearts, and I will give to each of you as your works deserve.
29 Let him that hath an ear, hear what the Spirit saith to the Churches.