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 40
إِلَّا عِبَادَكَ مِنۡهُمُ ٱلۡمُخۡلَصِينَ ٤٠
(Kecuali hamba-hamba Engkau yang mukhlis di antara mereka") yakni orang-orang yang beriman.