Commentary explaining the meaning of the ayahs. One passage often covers several ayahs, so neighbouring ayahs can show the same text.
Tafsir Jalalayn tafsir for Surah Al-Hijr — Ayah 99
وَٱعۡبُدۡ رَبَّكَ حَتَّىٰ يَأۡتِيَكَ ٱلۡيَقِينُ ٩٩
(Dan sembahlah Rabbmu sampai datang kepadamu yang diyakini) yaitu ajal.