The obligatory prayer suffices for the greeting of the mosque and the sunnah of wudu'
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Q6: I am accustomed to starting my prayer in the mosque with the sunnah of wudu' and then the greeting of the mosque, but I entered the mosque and the imam was about to pray the midday prayer, so should I pray with him in congregation and then pray these sunnahs? And how should the intention be?
A6: If you enter the mosque and the iqamah is called, pray with them and do not pray a voluntary prayer after the iqamah for the obligatory prayer, due to the saying of the Prophet (peace and blessings be upon him)Jami` at-Tirmidhi 421Sahih (Darussalam). The obligatory prayer suffices for you for the greeting of the mosque and the sunnah of wudu'. And success is from Allah, and may Allah send prayers and blessings upon our Prophet Muhammad, his family, and his Companions.
A6: If you enter the mosque and the iqamah is called, pray with them and do not pray a voluntary prayer after the iqamah for the obligatory prayer, due to the saying of the Prophet (peace and blessings be upon him)
When the Iqamah has been called for the Salat then there is no Salat except the obligatory.
إذا أقيمت الصلاة فلا صلاة إلا المكتوبة
Source
www.alifta.gov.sa
The Arabic text is copied verbatim from the original source, without any edits.