口くちは災わざわいのもと The Mouth is the Origin of Disasters

口くちは災わざわいのもと (or 口くちは禍わざわいのもと) The mouth is the origin of disasters

口くちは禍わざわいのもとだから、噂話うわさばなしはやめたほうがいい。

The mouth is the origin of disasters, therefore you should stop gossiping.

口くち – mouth
は – (topic particle)
禍わざわい – calamity; disaster; catastrophe
だから – so; therefore
噂話うわさばなし – gossip (噂うわさ rumor; hearsay + 話はなし talk; story – in the compound はなし becomes ばなし)
やめたほうがいい – should (ought to) stop

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