Surah Taha 20:2

مَآ أَنزَلْنَا عَلَيْكَ ٱلْقُرْءَانَ لِتَشْقَىٰٓ

We have not sent down to you the Qur’ān that you be distressed

Translation: Saheeh International

Tafsir

We have not revealed the Qur’ān to you O Muhammad (s) that you should be miserable that you should toil because of what you used to do after it was revealed to you in the way of long vigils performing night prayers; in other words so unburden your soul;

Excerpt from Tafsir al-Jalalayn, commentary on 20:2, via Quran.com. The reader has the full commentary and 9 more tafsirs.