Explanation of the Book of Prayer-20

The Shaykh : Now, let us take a new lesson. He said: "And from Ibn 'Umar (may Allah be pleased with them both):

The Prophet (ﷺ) used to raise his hands parallel to his shoulders when he started the prayer (by saying Allahu Akbar), when he uttered the Takbir to bow and when he raised his head from the Ruku' (bowing posture).

أن النبي صلى الله عليه وسلم كان يرفع يديه حذو منكبيه إذا افتتح الصلاة، وإذا كبر للركوع، وإذا رفع رأسه من الركوع.

Bulugh al-Maram 2:155

Agreed upon by al-Bukhari and Muslim.
And in the hadith of Abu Humayd in Abu Dawud:

he raised his hands so as to bring them opposite his shoulders, and uttered the takbir

يرفع يديه حتى يحاذي بهما منكبيه ثم يكبر

Sunan Abi Dawud 730Sahih (Al-Albani)

.
And Muslim, from Malik ibn al-Huwayrith, has a similar hadith to that of Ibn 'Umar, but he said:

until they were in level with the highest part of his ears.

حتى يحاذي بهما فروع أذنيه.

Sunan an-Nasa'i 1056Sahih (Darussalam)

".
He says: he raises his hands in the hadith of Ibn 'Umar to the level of his shoulders. "Hadhwa" means equal to his shoulders, and the shoulder is the area between the top of the shoulder and the neck, meaning like this, like this, to the level of his shoulders.
And his saying: means when he says the takbir of ihram, because he begins the prayer with it, as came in the hadith from the Prophet (peace and blessings be upon him), and as previously mentioned from 'A'ishah, that he begins the prayer with the takbir. And "when he says the takbir for bowing" means when he begins the takbir for bowing; the meaning is not when he reaches the bowing, but when he begins. These are two places.
The third: and when he raises his head from bowing, after he has completed standing, he raises his hands. These are three places. And the wisdom