Surah Al-Hijr — Ayah 14 (15:14)
وَلَوۡ فَتَحۡنَا عَلَيۡهِم بَابٗا مِّنَ ٱلسَّمَآءِ فَظَلُّواْ فِيهِ يَعۡرُجُونَ ١٤
English translation (Saheeh International)
And [even] if We opened to them a gate from the heaven and they continued therein to ascend,
Brief commentary
These liars will remain stubborn even if the truth became obvious to them through clear proofs, even if I opened for them a door from the heavens and they continued to ascend through it.