If somebody is leading the Salat (prayer) and (in the meanwhile) the first (usual) Imam comes, the Salat is valid whether the former retreats or does not retreat
حَدَّثَنِي عَبْدُ الْعَزِيزِ بْنُ عَبْدِ اللَّهِ، قَالَ حَدَّثَنِي سُلَيْمَانُ، عَنْ ثَوْرِ بْنِ زَيْدٍ، عَنْ أَبِي الْغَيْثِ، عَنْ أَبِي هُرَيْرَةَ ـ رضى الله عنه ـ أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ اجْتَنِبُوا الْمُوبِقَاتِ الشِّرْكُ بِاللَّهِ، وَالسِّحْرُ "
Narrated Abu Huraira:
Allah's Messenger (ﷺ) said, "Avoid the Mubiqat, i.e., shirk and witchcraft."
Reference: Sahih al-Bukhari 5764 In-book : Book 76, Hadith 78 USC-MSA web (English) : Vol. 7, Book 71, Hadith 659 (deprecated)
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