Using my bible software it takes about 5 seconds to search the whole bible. I searched the bible for the phrase NO MERCY. Here is what I found;
Isa 47:6 I was wroth with my people, I profaned mine inheritance, and gave them into thy hand: thou didst show them NO MERCY; upon the aged hast thou very heavily laid thy yoke.
Jer 6:23 They lay hold on bow and spear; they are cruel, and have NO MERCY; their voice roareth like the sea, and they ride upon horses, every one set in array, as a man to the battle, against thee, O daughter of Zion.
Jer 50:42 They lay hold on bow and spear; they are cruel, and have NO MERCY; their voice roareth like the sea; and they ride upon horses, every one set in array, as a man to the battle, against thee, O daughter of Babylon.
Ho 2:4 Yea, upon her children will I have NO MERCY; for they are children of whoredom;
Jas 2:13 For judgment [is] without mercy to him that hath showed NO MERCY: mercy glorieth against judgment.