يَٰٓأَيُّهَا ٱلَّذِينَ ءَامَنُوٓا۟ إِذَا لَقِيتُمْ فِئَةً فَٱثْبُتُوا۟ وَٱذْكُرُوا۟ ٱللَّهَ كَثِيرًا … وَلَا تَنَٰزَعُوا۟ فَتَفْشَلُوا۟ وَتَذْهَبَ رِيحُكُمْ وَٱصْبِرُوا۟
"When you meet a company, stand firm and remember God much… Do not quarrel with one another, or you will lose heart and your wind will go. And be patient."
The lexicographers explain this idiom as strength, ascendancy, affairs going well; it is recorded that it is taken from seafaring and resembles a sail's losing its wind.
I transmit this in the form the lexicographers give it, and I add this as my own reading: the idiom carries that strength is something that does not issue from oneself — the wind is not the ship's property.
And the chain must be recorded: tanāzuʿ (quarrelling) → fashal (losing heart) → dhahābu'r-rīḥ (the going of the strength). Three steps, in a single sentence.
And this overlaps with the first verse of the sūra: wa aṣliḥū dhāta baynikum — set right what is between you. The sūra gives the same matter first as a command, then as a chain of consequences. This is a weave that can be verified within the sūra.
وَلَا تَكُونُوا۟ كَٱلَّذِينَ خَرَجُوا۟ مِن دِيَٰرِهِم بَطَرًا وَرِئَآءَ ٱلنَّاسِ (47) — baṭaran: exultant swagger, the bewilderment that comes of plenty. The root occurs here for the first time in the index. Riʾāʾa'n-nās — display before people.