أَلَا لَا يَحِلُّ مَالُ امْرِئٍ إِلَّا بِطِيبِ نَفْسٍ مِنْهُ
Take heed: a person’s property is not lawful without their willing consent.
Source: البيهقي
أَلَا is an attention marker: “Take heed!” لَا يَحِلُّ means “is not permissible,” مَالُ امْرِئٍ means “a person’s property,” and بِطِيبِ نَفْسٍ مِنْهُ means “with their willing consent.”
The hadith emphasizes genuine willingness in dealings involving property. إِلَّا introduces the exception and condition. A person’s assent should not be treated as real consent if extracted through pressure or concealment.