Al-Baqara · 2:7

خَتَمَ اللّٰهُ عَلٰى قُلُوبِهِمْ وَعَلٰى سَمْعِهِمْۜ وَعَلٰٓى اَبْصَارِهِمْ غِشَاوَةٌۘ وَلَهُمْ عَذَابٌ عَظ۪يمٌ۟

God has sealed their hearts and their ears, and their eyes are covered. They will have great torment

خَتَمَ
khatama

The coloured letters are the root — the meaning core. The rest are prefixes, vowels and the pattern. Learn to spot them and you can find the root in a word you've never seen.

Meaning
has sealed
Part of speech
Verb (فعل)
Root meaning
The root ختم (khtm) primarily refers to sealing or stamping, like with clay or wax.
Dictionary form
خَتَمَ
Verb form
Form I (فَعَلَ)
Tense
Past (māḍī)
Voice
Active
Mood
Past (mabnī)
Person
3rd person masculine singular
Role
Verb; its subject is the following ‘Allah’
Case
Past verb (mabnī)
Grammar
‘Has sealed’ — a past verb. Its subject comes right after (‘Allah’), and what is sealed follows with ‘upon’: their hearts and hearing.
Conjugation

In the past, the suffix carries the subject (‑tu = I, ‑nā = we, ‑ta = you).