Abu Wa'il narrates: Sayyiduna Ali (may Allah be pleased with him) and Sayyiduna Ibn Mas'ud (may Allah be pleased with him) would not recite "Bismillah al-Rahman al-Rahim" aloud, nor the ta'awwudh (seeking refuge), nor "Amin".
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 9272