Go out and announce in medina that prayer is not valid but the recitation of the Quran even though it might be fatihat al-kitab and something more.
Sunan Abi Dawud Book 2, Hadith 429
← Previous Hadith we were commanded to recite Fatihat al-kitab and whatever was convenient (from the Quran during the prayer).

Sunan Abi Dawud Book 2, Hadith 428 Next Hadith → The Messenger of Allah (ﷺ) commanded me to announce that prayer is not valid but with the recitation of Fatihat al-kitab and something more.

Sunan Abi Dawud Book 2, Hadith 430