Bab al-Rayyan is the name of one of the gates of heaven. It is through this gate that people who observe the fast will enter heaven on the day of judgment.
Abu Hurairah [ra] reported that the Prophet Muhammad [saw] had said: “Whoever gives anything to others for the sake of God, he will be called to enter paradise with the words, ‘O slave of God! It is good for you.’ Those who perform the prayers will be invited to enter paradise through the gate of prayer. Whoever partakes in jihad, he will be called through the gate of jihad. Those who are among the people who give charity to others will be invited through the gate of charity. Those who observe the fast will be called to enter the paradise through the gate of Rayyan.” When Abu Bakr al-Siddiq (a close companion of the Prophet) asked him whether one can be invited to paradise from all of these gates, he replied: “Yes. I hope you will be one of them.”
In Islamic law, najis are things or persons regarded as ritually unclean. Contact with najis things brings a Muslim into a state of ritual impurity (najasat), which requires undergoing purification before performing religious duties, such as regular prayers.
You people recite this verse, "You who believe, care for yourselves; he who goes astray cannot harm you when you are rightly guided." I heard Allah's Messenger SAAWS say, "When people see something objectionable and do not change it, Allah will soon include them all in His punishment." [Ibn Majah and Tirmidhi, who declared it to be sahih, transmitted it.]
Hadith - Bukhari, Volume 3, Book 49, Number 861. Narrated Aisha, r.a.
Allah's Apostle SAAWS said, "If somebody innovates something which is not in harmony with the principles of our religion, that thing is rejected."