´It was narrated that Abdullah said:` "The Messenger of Allah (ﷺ) taught us the prayer. He stood up and said the takbir, and when he wanted to bow, he put his hands together and put his hands between his knees and bowed." News of that reached Sa'd and he said: "My brother has spoken the truth. We used to do that, then we were commanded to do this," meaning to hold the knees.
Hadith Referenceسنن نسائي / كتاب التطبيق / 1032
Hadith Gradingالألبانی:صحيح | زبیر علی زئی:إسناده صحيح
1032. Commentary: This method is called "tatbiq" (placing one hand over the other during prayer), which is abrogated. Abdullah ibn Mas'ud radi Allahu anhu was not aware of this, so he used to do it; however, none of the jurists (fuqaha) of the Ummah accepted his view, not even the Hanafis, who generally do not reject his opinions.
Source: Sunan Nasa'i: Translation and Benefits by Shaykh Hafiz Muhammad Amin Hafizullah, Page: 1032