אִ֣ישׁ תַּ֭הְפֻּכוֹת יְשַׁלַּ֣ח מָד֑וֹן וְ֝נִרְגָּ֗ן מַפְרִ֥יד אַלּֽוּף׃
A froward man soweth strife; And a whisperer separateth familiar friends.
Rashi on Proverbs
and a grumbler alienates the Lord And through his grumbling, he alienates the Lord of the world from himself.