The north - The ten tribes, settled by Salmanezer in the north of Assyria.
I will not cause mine anger to fall upon you - literally, I will not cause my face “to fall upon you:” i. e., “I will not receive you with averted looks.” The “and” before this clause should be omitted, as also before the next clause, “I will not keep ...”
I will not keep - All God’s promises and threats are conditional upon man’s conduct.