Nearby ayahs help place verse 29:3 in sequence and meaning.
أَحَسِبَ ٱلنَّاسُ أَن يُتْرَكُوٓا۟ أَن يَقُولُوٓا۟ ءَامَنَّا وَهُمْ لَا يُفْتَنُونَ
Do the people think that they will be left to say, "We believe" and they will not be tried?
أَمْ حَسِبَ ٱلَّذِينَ يَعْمَلُونَ ٱلسَّيِّـَٔاتِ أَن يَسْبِقُونَا ۚ سَآءَ مَا يَحْكُمُونَ
Or do those who do evil deeds think they can outrun Us? Evil is what they judge.
مَن كَانَ يَرْجُوا۟ لِقَآءَ ٱللَّهِ فَإِنَّ أَجَلَ ٱللَّهِ لَـَٔاتٍ ۚ وَهُوَ ٱلسَّمِيعُ ٱلْعَلِيمُ
Whoever should hope for the meeting with Allah - indeed, the term decreed by Allah is coming. And He is the Hearing, the Knowing.