They travelled to greatdistances, different countries for jihad and to teach different people, yet they (sahabas) nevertaught any Muslim to speak his niyat verbally for salah or fasting.Every new action in Islam which is not in accordance to what rasool (s.a.w) taught is rejectedand cursed (Bukhari, muslim and etc - Agreed Upon)Link 1 : Learn why Bid'ah is the most dangerous thing ever !2.