Joining the Imam in the final Tashahhud

A: Whoever enters the Masjid (mosque) while the Imam is offering the last Tashahhud, he should join him until the Salah is concluded. This is in accordance with the Hadith reported from the Prophet (peace be upon him) that he said, ("Whoever enters the Masjid while the congregation Salah is being offered, he should follow the Imam in what he does"). Related by Al-Tirmidhy. It is also reported in the authentically agreed upon Hadith that the Prophet (peace be upon him) said, When you come to prayer, go with tranquility, and pray what you are in time for, and complete (what you have missed). Therefore, if a person enters the Masjid while the Imam is offering Tashahud, then he should do the same and after the Imam ends Salah, he should stand and offer the missed Rak`ahs (units of Prayer). (Part No. 6; Page No. 225) May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.