Narrated Abdullah ibn Amr ibn al-As: The Prophet ﷺ said: When the Imam completes the prayer and sits (for reciting tashahhud), and then becomes defiled (i. e. his ablution becomes void) before he speaks (to someone), his prayer becomes complete. And those who prayed behind him also complete the prayer.
Explanation & Benefits
Shaykh Umar Farooq Saeedi
617. Commentary:
This narration is weak in its chain of transmission, therefore it is not admissible as evidence. It is established from authentic ahadith that the tashahhud and the salam are obligatory. Therefore, if the ablution (wudu) of the imam or follower is nullified before the salam, the prayer must be repeated. The following hadith is evidence for the obligation of the salam.
Source: Sunan Abu Dawood – Commentary by Shaykh Umar Farooq Saeedi, Page: 617