لا يَحِلُّ مالُ المُؤمِنِ إلّا بِطيبِ نَفسِهِ The Property of the Believer is Unlawful (Haram) to Use Except with his Consent

3ـ رسولُ اللهِ‏ِ (صَلَّيَ اللهُ عَلَيهِ وَ آلِهِ) : لا يَحِلُّ لامرئٍ مِن مالِ أخيهِ شيءٌ إلّا بطِيبِ نَفْسٍ مِنهُ.

3– The Prophet (SAWA) said, ‘It is unlawful for anyone to use the property of his brother except by his consent.’[Kanz al-`Ummal, no. 30345]