Sura Fuṣṣilat 41:53

سَنُرِيهِمْ ءَايَٰتِنَا فِى ٱلْأَفَاقِ وَفِىٓ أَنفُسِهِمْ حَتَّىٰ يَتَبَيَّنَ لَهُمْ أَنَّهُ ٱلْحَقُّ أَوَلَمْ يَكْفِ بِرَبِّكَ أَنَّهُۥ عَلَىٰ كُلِّ شَىْءٍ شَهِيدٌ

sa-nurīhim āyātinā fī l-afāqi wa-fī anfusihim ḥattā yatabayyana lahum annahu l-ḥaqqu a-wa-lam yakfi bi-rabbika annahu ʿalā kulli shayʾin shahīdun

Soon will We show them our Signs in the (furthest) regions (of the earth), and in their own souls, until it becomes manifest to them that this is the Truth. Is it not enough that thy Lord doth witness all things?

Sura al-Najm 53:7

وَهُوَ بِٱلْأُفُقِ ٱلْأَعْلَىٰ

wa-huwa bil-ufuqi l-aʿlā

While he was in the highest part of the horizon:

Sura al-Takwīr 81:23

وَلَقَدْ رَءَاهُ بِٱلْأُفُقِ ٱلْمُبِينِ

wa-la-qad raʾāhu bil-ufuqi l-mubīni

And without doubt he saw him in the clear horizon.