Mishkat al-Masabih 4 Prayer كتاب الصلاة 270

عَنِ ابْنِ عَبَّاسٍ قَالَ: كَانَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ يَفْتَتِحُ صَلَاتَهُ بِ (بِسم الله الرَّحْمَن الرَّحِيم) رَوَاهُ التِّرْمِذِيُّ وَقَالَ: هَذَا حَدِيثٌ لَيْسَ إِسْنَادُهُ بِذَاكَ

Ibn ‘Abbas said that God’s Messenger used to begin his prayer with, “In the name of God, the Compassionate, the Merciful.” Tirmidhi transmitted it and said that the isnad of this tradition is not approved.