– raḥālunā: a person’s dwelling and the furnishings that belong to it. The phrase occurs in the ḥadith, “When the sandals are drenched, then perform the prayer in the lodgings.”
– falā tafʿalā: the particle lā here is prohibitive; the verb that follows is in the jussive mood, indicated by dropping the final nūn, while the alif represents the subject pronoun (the two of you).
– adraktumā: one says, “adraktu al-shayʾ” when he pursues something and succeeds in catching up with it.
– nāfila: the first prayer they performed counts as the obligatory prayer, and this repeated one is voluntary. A nāfila is an act that adds to one’s reward.

What is learned from the ḥadith
1 – The report shows the commendability of repeating the congregational prayer for someone who has already prayed, then comes to the mosque and finds the people praying, or when the iqāma is called while he is in the mosque.
2 – It proves that praying at home is valid even without an excuse, yet one incurs sin for abandoning the congregational prayer in the mosque without a valid excuse, as was mentioned earlier in the ḥadith of Abū Hurayra and others.
3 – It indicates that the obligatory prayer is the first one—whether offered in congregation or alone—and that the repeated prayer counts as a supererogatory act.
4 – The ḥadith affirms the obligation of enjoining what is right and forbidding what is wrong, to be done with wisdom and gentle exhortation.
5 – It highlights the Prophet’s fine character and excellent manner of instruction: he first asked why the two men had not joined the prayer; when he learned they had no valid excuse, he kindly directed them to what they ought to do.
6 – Being present for the congregation yet failing to join the imam arouses suspicion—that the person dislikes the imam, does not pray, or the like. A Muslim is expected to dispel such suspicions about himself; doing so is not considered ostentation (riyāʾ).
7 – Once an act of worship has been completed, it cannot be annulled; it has already taken effect. Had cancellation been permissible, the Prophet ﷺ would have told those two men to void the prayer they had performed at home and treat the congregational prayer as the obligatory one, making the first merely voluntary.