The particle لَمْ negates a present-tense verb with past-time meaning and governs the jussive form. In this report, لَمْ يَرِحْ conveys a powerful warning about deprivation. The phrase رَائِحَةَ الْجَنَّةِ is an iḍāfah construction: “the fragrance of Paradise,” with رَائِحَةَ as the first noun and الْجَنَّةِ as the genitive second noun.
The imagery is meant to impress the seriousness of taking protected life. It is not a mere vocabulary exercise. The practical lesson is to safeguard the lives and security of others and to honour entrusted protections.