Commentary explaining the meaning of the ayahs. One passage often covers several ayahs, so neighbouring ayahs can show the same text.
Indoniesua Al-Mukhtasar in Interpreting the Noble Quran tafsir for Surah Ar-Rahman — Ayah 50
فِيهِمَا عَيۡنَانِ تَجۡرِيَانِ ٥٠
Di dalam dua surga itu ada dua mata air yang mengalirkan air.