My father said, "Messenger of Allah ﷺ used to raise both his hands up to the level of his shoulders when opening the prayer; and on saying the Takbir for bowing. And on raising his head from bowing he used to do the same and then say "Samiʿa l-lahu liman hamidah, Rabbana wa laka l-hamd." And he did not do that (i.e. raising his hands) in prostrations. (Using translation from Bukhārī 735)
أَنَّ رَسُولَ اللهِ ﷺ كَانَ يَرْفَعُ يَدَيْهِ حَذْوَ مَنْكِبَيْهِ
Yahya related to me from Malik from Yahya ibn Sa'id from Sulayman ibn Yasar that the Messenger of Allah ﷺ used to raise his hands in the prayer.
أَنَّ رَسُولَ اللَّهِ ﷺ كَانَ يَرْفَعُ يَدَيْهِ فِي الصَّلاَةِ
[Machine] In English, it translates to: "Verily, the Prophet ﷺ used to raise his hands parallel to his shoulders when saying the takbeer (saying Allahu Akbar) and when initiating the prayer, as well as when going into ruku' (bowing) and when going into sujud (prostration)."
أَنَّ النَّبِيَّ ﷺ كَانَ يَرْفَعُ يَدَيْهِ حَذْوَ مَنْكِبَيْهِ حِينَ يُكَبِّرُ وَيَفْتَتِحُ الصَّلَاةَ وَحِينَ يَرْكَعُ وَحِينَ يَسْجُدُ