I noticed during the reading of the haftorah of parshas Yisro that the word למרבה is spelled לםרבה,this is certainly a strange phenomenon since a mem sofit everywhere else is always at the end of the word. Why is it written this way and what is it teaching us?
Passuk 9:6 :
לםרבה [לְמַרְבֵּ֨ה] הַמִּשְׂרָ֜ה וּלְשָׁל֣וֹם אֵֽין־קֵ֗ץ עַל־כִּסֵּ֤א דָוִד֙ וְעַל־מַמְלַכְתּ֔וֹ לְהָכִ֤ין אֹתָהּ֙ וּֽלְסַעֲדָ֔הּ בְּמִשְׁפָּ֖ט וּבִצְדָקָ֑ה מֵעַתָּה֙ וְעַד־עוֹלָ֔ם קִנְאַ֛ת יְהוָ֥ה צְבָא֖וֹת תַּעֲשֶׂה־זֹּֽאת