Question:

Imam saheb started reciting Surah Dahr in Fajr salah. He recited around 13 to 14 verses and then made rukoo’. In the second rakat he recited the remainder verses. In the 26th verse he recited  سبه instead of سبحه. Is this salah valid? Or is it necessary to repeat the salah?

Answer: حامدا ومصليا ومسلما

If the imam recited in that manner in reality then it is necessary to repeat the salah due to the distortion in meaning.

  (و القاعدة عند المتقدمين ان ما غير تغييرا يكون اعتقاده كفرا يفسد في جميع ذلك سواء كان في القران او لم يكن : (كبيري ص 476

 Allah knows best.
Hazrat Mufti Ahmad Khanpuri Saheb (May Allah preserve him)
Mahmoodul Fataawaa 1/463