First thing's first - Idioms by The Free Dictionary
https://idioms.thefreedictionary.com/first+thing%27s+first
WEB(often humorous) the most important or necessary duties, matters, etc. must be dealt with before others: First things first. We must make sure the electricity is turned off before we start repairing the cooker. ♢ We have a lot to discuss, but, first things first, let’s have a cup of coffee! See also: first, thing.
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