never test the depth of water with both feet
Definition:  before you do something, think about it first, or always analyse situations before engaging in them
Usage:  my financial adviser told me not to put all my savings into the same investment account, due to market volatility; this taught me to never test the depth of water with both feet

SEPEDI
Translation:  o se ke wa tsoga o hlohleditše go iša fase ga meetse ka maoto a mabedi
Proverb: mpša e lomile mong wa yona

XITSONGA
Translation:  u nga ringeti ku enta ka mati hi milenge mimbirhi
Proverb: u nga tsemi rhavi u tshame eka rona

TSHIVENḒA
Translation:  u songo linga vhudzivha ha maḓi nga milenzhe yoṱhe
Proverb: u sa athu u hama kholomo, i vhofhe