Surah As-Saffat 37:173

وَإِنَّ جُندَنَا لَهُمُ ٱلْغَـٰلِبُونَ

And [that] indeed, Our soldiers [i.e., the believers] will be those who overcome.

Translation: Saheeh International

Tafsir

and assuredly Our hosts namely the believers they will indeed be the victors over the disbelievers by their being given the definitive proofs and assistance against them in this world. And if some of these believers are not victorious over them in this world then assuredly in the Hereafter they will be so.

Excerpt from Tafsir al-Jalalayn, commentary on 37:173, via Quran.com. The reader has the full commentary and 9 more tafsirs.