Mary
وَأَنذِرْهُمْ يَوْمَ ٱلْحَسْرَةِ إِذْ قُضِىَ ٱلْأَمْرُ وَهُمْ فِى غَفْلَةٍ وَهُمْ لَا يُؤْمِنُونَ
And warn them, [O Muhammad], of the Day of Regret, when the matter will be concluded; and [yet], they are in [a state of] heedlessness, and they do not believe.
Nearby ayahs help place verse 19:39 in sequence and meaning.
فَٱخْتَلَفَ ٱلْأَحْزَابُ مِنۢ بَيْنِهِمْ ۖ فَوَيْلٌ لِّلَّذِينَ كَفَرُوا۟ مِن مَّشْهَدِ يَوْمٍ عَظِيمٍ
Then the factions differed [concerning Jesus] from among them, so woe to those who disbelieved - from the scene of a tremendous Day.
أَسْمِعْ بِهِمْ وَأَبْصِرْ يَوْمَ يَأْتُونَنَا ۖ لَـٰكِنِ ٱلظَّـٰلِمُونَ ٱلْيَوْمَ فِى ضَلَـٰلٍ مُّبِينٍ
How [clearly] they will hear and see the Day they come to Us, but the wrongdoers today are in clear error.
إِنَّا نَحْنُ نَرِثُ ٱلْأَرْضَ وَمَنْ عَلَيْهَا وَإِلَيْنَا يُرْجَعُونَ
Indeed, it is We who will inherit the earth and whoever is on it, and to Us they will be returned.
وَٱذْكُرْ فِى ٱلْكِتَـٰبِ إِبْرَٰهِيمَ ۚ إِنَّهُۥ كَانَ صِدِّيقًا نَّبِيًّا
And mention in the Book [the story of] Abraham. Indeed, he was a man of truth and a prophet.