[:en]Israel was called “faithless” while Judah was called “unfaithful”. “Faithless Israel is more righteous than unfaithful Judah” (v. 11) The Lord told Jeremiah to tell Israel that He will be merciful if they will acknowledge their guilt and turn back to Him.
Judah became unfaithful when they backslided and worshiped idols. Backsliding means disloyalty or faithless. When a grain of sin enters into our system, it causes us to lose spiritual appetite and our first love to God. The only remedy is to accept the diagnose and return to Him.[:]