Saying it is the easy half
Two clauses, and the second is where the work is.
إِنَّ ٱلَّذِينَ قَالُوا۟ رَبُّنَا ٱللَّهُ ثُمَّ ٱسْتَقَـٰمُوا۟ فَلَا خَوْفٌ عَلَيْهِمْ وَلَا هُمْ يَحْزَنُونَ
Inna-lladhīna qālū rabbuna-llāhu thumma-staqāmū fa-lā khawfun ʿalayhim wa lā hum yaḥzanūn.
“Indeed, those who have said, "Our Lord is Allāh," and then remained on a right course - there will be no fear concerning them, nor will they grieve.”
Source
The Qur'an · 46:13
Qur'an
- Qur'anic text in the Uthmani script via Quran.com; translation: Saheeh International