Ash-Sharh • EN-TAFSIR-IBN-ABBAS
﴿ ٱلَّذِىٓ أَنقَضَ ظَهْرَكَ ﴾
“that had weighed so heavily on thy back?”
(Which weighed down thy back?) It is also said: prophethood weighed down your back; And the Prophet (pbuh) said: " Yes, indeed! "