Uttering niyah (intention) out loud for prayer is not permissible and is a form of bid’ah. Ibn al-Qayyim said in Zaad al-Ma’aad (1/201): “When the Prophet (peace and blessings of Allaah be upon him) stood up to pray, he would say: “Allaahu akbar,” and he did not say anything before that, or utter the intention [...]
