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Traveller joining congregation without knowing if imaam is also a traveller
If a traveller comes upon a congregation praying, and he does not know if the imaam is also a traveller (so that he can join the prayer with the intention of shortening it), or he is a resident (so that he can pray the complete prayer behind him), what should he do?
According to the strongest opinion, he should act on the basis of what he sees of signs of travel on the imaam, such as clothing or travel gear. If it appears to him that the imaam is a resident, then he should pray the complete prayer behind him.
The evidence for this is the report narrated by Ahmad from Ibn ‘Abbaas, who was asked: “What is the reason why a traveller prays two rak’ahs if he is alone and four rak’ahs if he prays behind a resident?” He said: “That is the sunnah.” According to another report he said: “That is the sunnah of Abu’l-Qaasim.” (Al-Haafiz did not comment on this hadeeth in al-Takhlees, 2/50, but Ahmad Shaakir classed its isnaad as saheeh in his commentary on al-Musnad, 3/260).
If he assumes that the imaam is a traveller, and prays two rak’ahs with the intention of praying a shortened prayer, then after salaam (completion of the prayer) he discovers that the imaam is in fact a resident and that these two rak’ahs were the third and fourth prayed by the imaam, in this case he should stand up, pray two more rak’ahs to complete the prayer, and do sujood sahw (an extra two prostrations). (Al-Majmoo’ li’l-Nawawi, 4/356). There is no harm done by any speaking or asking that were necessary for the sake of his prayer.