´It was narrated from Aishah that:` The Messenger of Allah (ﷺ) prayed, bowing four times, and he recited loudly, and every time he raised his head he said: "Sami Allahu liman hamidah. Rabbana wa lakal-hamd (Allah hears those who praise Him, Our Lord to You be praise.)."
Hadith Referenceسنن نسائي / كتاب الكسوف / 1495
Hadith Gradingالألبانی:صحيح | زبیر علی زئی:متفق عليه
1495. Commentary: That is, upon rising from both bowings (ruku‘), one should say only “Sami‘a Allahu liman hamidah...” It is reported from Imam Shafi‘i that after ruku‘ one should say “Allahu Akbar,” but this is not correct. In the face of an explicit narration, analogy (qiyas) is not valid.
Source: Sunan Nasa'i: Translation and Benefits by Shaykh Hafiz Muhammad Amin Hafizullah, Page: 1495