And the fifth [oath will be] that the curse of Allah be (24:7)

﴿وَالْخَامِسَةُ أَنَّ لَعْنَتَ اللَّهِ عَلَيْهِ إِن كَانَ مِنَ الْكَاذِبِينَ﴾
[ النور: 7]

24:7 And the fifth [oath will be] that the curse of Allah be upon him if he should be among the liars.

Then on his fifth testimony, he will add that he is deserving of curse if he is lying in what he has accused her of.

And the fifth (testimony) (should be) the invoking of the Curse of Allah on him if he be of those who tell a lie (against her).

phonetic Transliteration

Waalkhamisatu anna laAAnata Allahi AAalayhi in kana mina alkathibeena

Abdullah Yusuf Ali - Translation

And the fifth (oath) (should be) that they solemnly invoke the curse of Allah on themselves if they tell a lie.

Safi-ur-Rahman al-Mubarakpuri

And the fifth (testimony); invoking of the curse of Allah on him if he be of those who tell a lie.

Page 350 English transliteration