Does the noble Hadith (The angels invoke blessings upon anyone of you as long as he remains in his prayer-place and does not pass wind (or does not do Hadath): "O Allah! Forgive him, O Allah! Have mercy on him." And anyone of you is regarded as performing prayer as long as prayer is what detains him, and nothing but prayer prevents him from returning to his family) include someone who reviews the Qur’an while walking, not sitting, or sleeps in the mosque awaiting prayer? And does someone who loses his ablution and goes to perform Wudu' exit the scope of the Hadith? And is someone who performs Wudu' considered to be in a prayer-place?

Congregational prayer surpasses individual prayer by twenty-five degrees. This is because a person who performs ablution well and then comes to the mosque for prayer does not take a step but that Allah raises him a degree and removes a sin from him until he enters the mosque. And when he enters the mosque, he is considered to be in prayer as long as the prayer is what keeps him there, and the angels invoke blessings upon him and pray for his forgiveness and mercy as long as he remains in his prayer place and does not commit an impurity or cause harm therein.

The reward for sitting in the mosque awaiting prayer includes anyone who remains in the mosque, even if he moves from the spot where he prayed, because the intention is to populate the mosques. Moving may be for a benefit, such as reading the Qur'an or attending a knowledge lesson, just as the Prophet, peace and blessings of Allah be upon him, used to change his spot after Fajr prayer. This opinion has been supported by a number of scholars, such as Ibn Rajab, Al-Iraqi, Ibn Hajar, and Ibn Uthaymeen.

As for committing an impurity in the mosque (minor impurity or causing harm), this severs the reward and the angels' supplication until the worshiper performs ablution again. Sitting in the mosque after prayers, whether to await another prayer, or for remembrance, or reading the Qur'an, or seeking knowledge, has immense virtue and expiates sins, and it is akin to 'Ribat' (guarding the frontiers) in the way of Allah.