Sunan Abi Dawud 769
سنن أبي داود#769SahihMalik said:There is no harm in uttering supplication in prayer, in its beginning, in its middle, and in the end, in obligatory prayer or other
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Al-AlbaniSahih Maqtu
Muhammad Muhyi Al-Din Abdul HamidSahih Maqtu
Zubair Ali ZaiIsnaad Sahih
In-book reference: 2:379