Verses with the word reins in the Apocrypha (3 verses):

2 Esdras 5:34
And I said, No, Lord: but of very grief have I spoken: for my reins pain me every hour, while I labour to comprehend the way of the most High, and to seek out part of his judgment.

Wisdom of Solomon 1:6
For wisdom is a loving spirit; and will not acquit a blasphemer of his words: for God is witness of his reins, and a true beholder of his heart, and a hearer of his tongue.

1 Maccabees 2:24
Which thing when Mattathias saw, he was inflamed with zeal, and his reins trembled, neither could he forbear to shew his anger according to judgment: wherefore he ran, and slew him upon the altar.