Sunan Abi Dawud 776
سنن أبي داود#776SahihNarrated Aisha, Ummul Mu'minin: When the Messenger of Allah (ﷺ) began his prayer, he said: "Glory be to Thee, O Allah," and "Praise be to Thee" and "Blessed is Thy name, and Exalted is Thy greatness, sand there is no god but Allah." Abu Dawud said: This tradition is not well known from 'Abd al-Salam b. Harb. No one narrated this except Talq b. Ghannam. A group of narrators reported the description of prayer from (the narrator) Budail; they did not mention therein this supplication
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Al-AlbaniSahih
Muhammad Muhyi Al-Din Abdul HamidSahih
Shuaib Al ArnautSahih Lighairihi
Zubair Ali ZaiSahih
In-book reference: 2:386