His prayer is not rendered invalid, but he should say the tasleem again after the imam says it. End quote.
Shaykh ‘Abd al-‘Azeez ibn Baaz (may Allah have mercy on him)
Fataawa Noor ‘ala ad-Darb (2/936).
If the one who is praying behind an imam says the tasleem before the imam
Question: 132471
If one of those who are praying behind an imam says one tasleem to the right before the imam, by mistake, does that render his prayer invalid?
Answer
Praise be to Allah, and blessings and peace be upon the Messenger of Allah.
Source:
Shaykh ‘Abd al-‘Azez ibn Baz Fatawa Noor ‘ala ad-Darb
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