50:42
يَوْمَ يَسْمَعُونَ ٱلصَّيْحَةَ بِٱلْحَقِّ ۚ ذَٰلِكَ يَوْمُ ٱلْخُرُوجِ
The Day they will hear the blast [of the Horn] in truth. That is the Day of Emergence [from the graves].
Qaf
يَوْمَ يَسْمَعُونَ ٱلصَّيْحَةَ بِٱلْحَقِّ ۚ ذَٰلِكَ يَوْمُ ٱلْخُرُوجِ
The Day they will hear the blast [of the Horn] in truth. That is the Day of Emergence [from the graves].
Nearby ayahs help place verse 50:42 in sequence and meaning.
وَمِنَ ٱلَّيْلِ فَسَبِّحْهُ وَأَدْبَـٰرَ ٱلسُّجُودِ
And [in part] of the night exalt Him and after prostration.
وَٱسْتَمِعْ يَوْمَ يُنَادِ ٱلْمُنَادِ مِن مَّكَانٍ قَرِيبٍ
And listen on the Day when the Caller will call out from a place that is near -
إِنَّا نَحْنُ نُحْىِۦ وَنُمِيتُ وَإِلَيْنَا ٱلْمَصِيرُ
Indeed, it is We who give life and cause death, and to Us is the destination
يَوْمَ تَشَقَّقُ ٱلْأَرْضُ عَنْهُمْ سِرَاعًا ۚ ذَٰلِكَ حَشْرٌ عَلَيْنَا يَسِيرٌ
On the Day the earth breaks away from them [and they emerge] rapidly; that is a gathering easy for Us.