The Holy Quran 94:3 — Surah Al-Inshirah
Arabic text
ٱلَّذِىٓ أَنقَضَ ظَهْرَكَ
Translation
...that was breaking your back? (Because of his extraordinary piety, Rasulullaah ﷺ regarded the human mistakes that he sometimes made as serious violations. This was naturally very burdensome for him and referred to here as "the burden". By declaring blanket forgiveness for every past and future concern of Rasulullaah ﷺ, Allaah relieved him of this burden of his conscience.)
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