3 verses have
mercy
in Edition Clear Qur'an by Talal Itani / Al-Ankaboot (The Spider)

29:21He punishes whom He wills, and He grants mercy to whom He wills, and to Him you will be restored.

29:23Those who disbelieved in God’s signs and His encounter—these have despaired of My mercy. For them is a painful torment.

29:51Does it not suffice them that We revealed to you the Scripture, which is recited to them? In that is mercy and a reminder for people who believe.