The Holy Prophet (Sallallahu alaihi wa sallam) said: Give glad tidings to those who go to the Masjid in dark nights that in Qiyamah, they will be given torches of radiance. Others will be trembling with fear, but these people will be content and happy, as 2 fears, fear of this world and fear of hereafter are never united. Those who bore the fear of darkness in this world will not have fear in the next. Satan has less effect on those who frequent the Masjid. Masjid is a fortress for staying safe from Satan.
The Holy Prophet (Sallallahu alaihi wa sallam) also said: I want to pray for punishment for the people of the earth, but 3 things dissipate my anger. (1) Those who recite the Holy Quran and listen to it. (2) Those who serve the Masjid. (3) The innocent children of the Muslims.
The Masjid seem radiant to the dwellers of the heavens the way stars seem radiant to us.
A person who goes to the Masjid to offer the 5 daily Salaat gets the reward of Jihad (striving in the path of Allah) and on every coming to the Masjid, a mansion is built in Jannah for them. One virtue is given for every step taken towards the Masjid, one sin is effaced and the status of that person is raised by 1 degree.
One should place the right foot first when entering the Masjid and should recite this Dua:
Transliteration: Allahummaf Tahlee Abwaba Rahmatik.
When stepping out of the Masjid, one should put the left foot first and recite:
Transliteration: Allahumma Innee Asaluka Min Fadhlika.
Anecdote: Once Hadhrat Sufyan Thauri (May Allah Shower His mercy upon him) mistakenly placed his left leg first when entering the Masjid, a voice spoke from a corner of the Masjid: O bull! Where are you barging in? Hadhrat humbly repented for his act immediately and as an admonitory, he permanently added, “Thauri,” which means buffalo, to his name. Did you notice how important the etiquettes of the Masjid are and how Allah reprimands His friends. Even now, these reprimands are being given but alas that we are not able to understand them. Not only do we barge into the Masjid like bulls, but end up doing many useless things there as well.
Performing ablution and waiting in the Masjid for congregational Salaat is like offering Salaat itself. Angels pray for forgiveness and divine mercy for that person. When a Salaat is offered with congregation, it is rewarded 27 times over. When you offer all the 5 Salaat in the Masjid with congregation, you get the reward of 13500 Salaat. The details of this are that initially 50 Salaat were ordained. With the counsel of Hadhrat Moosa (May peace be upon him) and the intercession of the Holy Prophet (Sallallahu alaihi wa sallam), they were reduced to 5. The Lord Almighty said: It is an axiom of ours that no rule is changed. You offer 5 Salaat, the reward of 50 Salaat will be given. This is also axiomatic that every virtue is rewarded 10 times over. Thus, 10 x 27 x 50 equals 13500. What mercy of Allah! Even after this if a person does not offer Salaat with congregation, then how wretched that person is. The earlier nations did not enjoy this consideration. This is only for the sake of the Holy Prophet Hadhrat Muhammad Mustafa (Sallallahu alaihi wa sallam). Bounties are being showered. Alas that no is there to gather them.
For the one who donates prayer mats for the Masjid, 70,000 angels pray for that person’s forgiveness until those prayer mats become unusable. Houses are readies in Jannah for the people who participate in the construction of the Masjid. The dilapidated state of the Grand Masjid of Nuldarg and the disregard of the Muslims forced me to move my friends. It is the grace of Allah that His wish was accomplished through me. Otherwise, whomever He wants, He gets them to do His bidding. May Allah grant great rewards to all those who participated in this.
[Excerpted from Mawaaiz-e-Hasana, Vol. 1 of Hadhrat Muhaddith-e-Deccan]