And in the initial verses of part 30, Surah Alam Nashrah, the blessed chest and blessed back are mentioned in the following manner:

اَلَمْ نَشْرَحْ لَكَ صَدْرَكَۙ(۱) وَ وَضَعْنَا عَنْكَ وِزْرَكَۙ(۲) الَّذِیْۤ اَنْقَضَ ظَهْرَكَۙ(۳)

Did We not expand your chest for you (O Beloved)? And (We) removed that burden from you (O Beloved). Which had broken your back (an expression of extreme worry).

[Kanz-ul-Iman (translation of Quran)](Part. 30, Surah Alam Nashrah, verses 1 to 3)

O devotees of the Prophet! Let us listen to some Qur’anic verses that make mention of our Beloved Prophet’s blessed limbs, and the miracles that were manifested through these blessed limbs:

It is stated in part 27, Surah Al-Najm, verse 3:

وَ مَا یَنْطِقُ عَنِ الْهَوٰىؕ(۳)

And he does not say anything of his own desire.

[Kanz-ul-Iman (translation of Quran)](Part. 27, Surah Al-Najm, Verse 3)

And it is mentioned in part 25, Surah Al-Dukhan, verse 58:

فَاِنَّمَا یَسَّرْنٰهُ بِلِسَانِكَ

So We have made this Qur’aan easy in your language

[Kanz-ul-Iman (translation of Quran)](Part. 25, Surah Dakhaan, Verse. 58)

صَلُّوۡا عَلَى الۡحَبِيۡب                        صَلَّى اللّٰهُ عَلٰى مُحَمَّد