Surah Ash-Shams 91:10

وَقَدْ خَابَ مَن دَسَّىٰهَا

And he has failed who instills it [with corruption].

Translation: Saheeh International

Tafsir

and he will indeed have failed he who eclipses it he who obscures it with acts of disobedience dassāhā is actually dassasahā but the second sīn has been replaced with an alif for phonetic ease.

Excerpt from Tafsir al-Jalalayn, commentary on 91:10, via Quran.com. The reader has the full commentary and 9 more tafsirs.