Weak
graded by Al-Albani
Mishkat al-Masabih 2170
وَعَنْ عَبْدِ الْمَلِكِ بْنِ عُمَيْرٍ مُرْسَلًا قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «فِي فَاتِحَةِ الْكِتَابِ شِفَاءٌ مِنْ كُلِّ دَاءٍ» . رَوَاهُ الدَّارمِيّ وَالْبَيْهَقِيّ فِي شعب الْإِيمَان
‘Abd al-Mālik b. ‘Umair reported in mursal form that God's messenger said, “Fātihat al-Kitāb contains healing for every disease.” Dārimī and Baihaqi, in Shu'ab al-īmān, transmitted it.
Reported by Ad-Darimi (No. 3236). Cited in Mishkat al-Masabih (No. 2170).