'Be Merciful' in the Bible

then will I also cast away the seed of David my servant: so that I will take no prince out of his seed, to rule the posterity of Abraham, Isaac, and Jacob. But yet I will turn again their captivity, and be merciful unto them."

In those days and at the same time, sayeth the LORD, if the offense of Israel be sought for, there shall none be found. If men inquire for the sin of Judah, there shall be none: for I will be merciful unto them, whom I suffer to remain over.