Surah Sad 38:84

قَالَ فَٱلْحَقُّ وَٱلْحَقَّ أَقُولُ

[Allāh] said, "The truth [is My oath], and the truth I say -

Translation: Saheeh International

Tafsir

He said ‘So the truth is — and the truth I always speak read both words in the accusative fa’l-haqqa wa’l-haqqa; or with the first in the nominative and the second in the accusative because of the verb aqūlu ‘I speak’ that follows. …

Excerpt from Tafsir al-Jalalayn, commentary on 38:84, via Quran.com. The reader has the full commentary and 9 more tafsirs.