And those who selected a Masjid which is harmful for spreading disbelief, making disassociation among the believers, and as a station for the one who fought against Lord Allah and His Messenger before; and they are surely swearing: "We intended nothing but the good", and Allah Witnesses that indeed, they are the liars.
The Masjid mentioned is about Masjid Al-Dirar which was constructed by the hypocrites in Medina at the time of Messenger. It was mainly for spreading hypocrisy, to make disassociation between the believers and to give a station for Abu Amir-who was the Christian priest from Kasraj Tribe and who encouraged the Meccan pagans to fight against Messenger and believers. “One who fought against Lord Allah and His Messenger before” mentioned in this verse is about Abu Amir.
After the Battle of Confederates by realizing the fact that none from Arabs can defeat Messenger and believers, Abu Amir went to Rome for turning the Roman Emperor against Messenger and believers at Medina. By hearing the news that about 3 lakhs of Roman soldiers are getting ready to fight against believers, Messenger along with 30,000 soldiers went to Tabuk for defending them. During this time, hypocrites in Medina build that harmful Masjid- Al-Dirar.
As explained in verse 3: 7 after 30 years of Messenger’s departure, there is no group of believers anywhere in the world. The Arabic Qur’an reading Fujjar are disassociated into different groups, and each group is indulged in making their Masjids. Thus, they are testifying the teaching of Lord through His Messenger: “Their Masjids will be huge concrete buildings, but they will be strayed from the Guidance –Adhikr” as explained in verses 2: 114-115.
So, the odd-believer who follows Adhikr can’t enter any Masjid maintained by these hypocrites and Mushriks. The believer who considers Lord as the Impartial will pray as: “Oh our Lord! Make us the leaders for those who are following and testifying Adhikr” as told in verse 25: 74. So he can’t follow or guide any disbelieving people. He is commanded to do Jihad against the Kuffar with Adhikr as explained in verse 9: 73. He will read Adhikr along with his family in the dusk and dawn and will do prolonged ‘Prostration of Recitation’ as explained in verses 7: 205-206 and 22: 77-78. See explanations 2: 62, 140 and 9: 17-19.