Mishkat al-Masabih 4 Prayer كتاب الصلاة 231

وَعَنْ قَبِيصَةَ بْنِ هُلْبٍ عَنْ أَبِيهِ قَالَ: كَانَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ يَؤُمُّنَا فَيَأْخُذُ شِمَالَهُ بِيَمِينِهِ. رَوَاهُ التِّرْمِذِيُّ وَابْنُ مَاجَه

Qabisa b. Hulb quoted his father as saying that God’s Messenger would lead them in prayer and hold his left hand in his right. Tirmidhi and Ibn Majah transmitted it.