O’ people, the doors of heaven are open in this month (Ramadhan). Ask your God not close them on you, and the doors of hell are closed; ask Allah (SWT) not to open them on you. The Satans are in chains in this month. Ask God not to allow them to dominate you. Imam Ali (AS) said: At this moment I stood up and asked: O’ the Prophet of Allah (SWT), what is the most superior of deeds in this month (Ramadhan)? The Prophet (PBUH) replied: O’ Abul-Hassan, the most superior of deeds in this month is avoiding Harams.
Then the Prophet (PBUH) cried; I asked: What made you to cry? The Prophet (PBUH) replied: O’ dear Ali, I cry because in this month (Ramadhan) while you are performing Salaat/Salaah, your head will be cut by the most wretched person and your face and beard will be covered in blood. Amiral Momeneen Ali (AS) said: O’ the Prophet of Allah (SWT), is my faith healthy? The Prophet (PBUH) replied: Yes, your religion is totally healthy.
Then the Prophet (PBUH) added: O’ Ali, your killer and the one who gets angry with you, has got angry with me, and the one who insults you, has insulted me; you are to me like my own life, your soul is from my soul and your nature is from my nature, Allah (SWT) created and chose you and I; me for the prophethood and you for Imamate of the Islamic Ummah; and whoever denies your Imamate, in fact has denied my prophethood .  Bihar, Vol. 96, Page 157 & Page 358; Oyun Akhbar Al-Ridha, Vol. 1, Page 295; Wasa’elul Shia, Kitab-e-Roozeh.