'Unrelenting' in the Bible
The Beloved to Her Lover: Set me like a cylinder seal over your heart, like a signet on your arm. For love is as strong as death, passion is as unrelenting as Sheol. Its flames burst forth, it is a blazing flame.
"This is what the sovereign Lord says: 'The Philistines have exacted merciless revenge, showing intense scorn in their effort to destroy Judah with unrelenting hostility.