Surah Al-Muddaththir 74:10
عَلَى ٱلْكَـٰفِرِينَ غَيْرُ يَسِيرٍ
For the disbelievers - not easy.
Translation: Saheeh International
Tafsir
for the disbelievers not at all easy herein is an indication that it will be easy for believers despite its harshness.
Excerpt from Tafsir al-Jalalayn, commentary on 74:10, via Quran.com. The reader has the full commentary and 9 more tafsirs.