Surah Ar-Rum 30:60

فَٱصْبِرْ إِنَّ وَعْدَ ٱللَّهِ حَقٌّ ۖ وَلَا يَسْتَخِفَّنَّكَ ٱلَّذِينَ لَا يُوقِنُونَ

So be patient. Indeed, the promise of Allāh is truth. And let them not disquiet you who are not certain [in faith].

Translation: Saheeh International

Tafsir

So be patient. Surely God’s promise to give you victory over them is true. And do not let them cause you to be inconstant those who are uncertain of the Resurrection in other words do not let them cause you to succumb to inconstancy and frivolity by abandoning patience that is to say do not abandon it.

Excerpt from Tafsir al-Jalalayn, commentary on 30:60, via Quran.com. The reader has the full commentary and 9 more tafsirs.