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
حَدَّثَنَا عُثْمَانُ بْنُ أَبِي شَيْبَةَ، وَمُحَمَّدٌ، قَالاَ أَخْبَرَنَا عَبْدَةُ، عَنْ هِشَامِ بْنِ عُرْوَةَ، عَنْ أَبِيهِ، عَنْ عَائِشَةَ ـ رضى الله عنها ـ قَالَتْ نَهَى رَسُولُ اللَّهِ صلى الله عليه وسلم عَنِ الْوِصَالِ، رَحْمَةً لَهُمْ فَقَالُوا إِنَّكَ تُوَاصِلُ. قَالَ إِنِّي لَسْتُ كَهَيْئَتِكُمْ، إِنِّي يُطْعِمُنِي رَبِّي وَيَسْقِينِ " قَالَ أَبُو عَبْدِ اللَّهِ لَمْ يَذْكُرْ عُثْمَانُ رَحْمَةً لَهُمْ
Narrated Aisha:
Allah's Messenger (ﷺ) forbade Al-Wisal out of mercy to them. They said to him, "But you practice Al- Wisal?" He said, "I am not similar to you, for my Lord gives me food and drink. "
Reference: Sahih al-Bukhari 1964 In-book : Book 30, Hadith 71 USC-MSA web (English) : Vol. 3, Book 31, Hadith 185 (deprecated)
Help us gift a modern, ad-free Islamic application for the Muslim Ummah. Your donation will be recorded as Sadaqah Jariyah in your book of deeds, In Sha Allah.