When you have finished your (obligatory) prayer in the mosque, you should observe some of your voluntary prayers at home
Jabir (May Allah be pleased with him)reported:The Messenger of Allah (may the peace and blessings of Allah be upon him) said, "When you have finished your (obligatory) prayer in the mosque, you should observe some of your voluntary prayers at home; for Allah will bless your homes because of your prayer (in your homes)."[Muslim]
The prayer is the most important practical pillar of Islam. He who established it has established the religion, and he who lost it has destroyed his religion. it is the manifest light for those who performed it with submissiveness, reverence and humbleness, and on the due time. It will be the source of rest and tranquility for the one who is mindful of its obligatory and voluntary parts.
It is the close connection between the servant and his Lord, in which he expresses the complete servitude and need for his Lord. There is no worship in which the slave expresses such a thing as prayer. He puts his forehead and nose on the ground whatever his status is and regardless of his authority.
What is meant by the prayer that the Muslim performs in the mosque is the obligatory prayers and the voluntary prayers related to them. Please note that If a Muslim comes to the mosque, he shall pray the greeting of the mosque.
We understand that obligatory prayer must be performed in a congregation unless there is a compelling necessity and a compelling excuse, no one but a hypocrite or a man whose faith weak.
Ibn Mas'ud (May Allah be pleased with him) reported:
He who likes to meet Allah tomorrow (i.e., on the Day of Requital) as a Muslim, should take care and observe the prayer when the Adhan is announced for them. Allah has expounded to your Prophet (may the peace and blessings of Allah be upon him) the ways of right guidance, and these (the prayers) are part of the right guidance. If you have to perform the prayer in your houses, as this man who stays away (from the mosque) and performs the prayer in his house, you will abandon the Sunnah (practice) of your Prophet (may the peace and blessings of Allah be upon him), and the departure from the Sunnah of your Prophet (may the peace and blessings of Allah be upon him) will lead you astray. I have seen the time when no one stayed behind except a well-known hypocrite. I also saw that a man was brought swaying (on account of weakness) between two men till he was set up in a row (in the mosque).
Offering the voluntary prayers in the houses spreads the goodness in the houses and the families including blessing the livelihood, the angels attend this prayer and hear what is read, the houses will be enlightened by the light of Allah the Almighty in addition to the other benefits which we do not know.
The one who applied this instruction will attain a great share of goodness in this world and in the Hereafter. He is a real Muslim who follows the Sunnah of the Prophet Muhammad. The Prophetic traditions instruct us to give the mosque its rights and to give the house its rights. This Muslim is a good example for his family and neighbors in terms of reviving the houses with the remembrance of Allah the Almighty.