أعرب الجملة يخشى المؤمن ربه

The believer fears his Lord. “يخشى” is a present tense verb with a hidden “ت” which means the believer is afraid. “المؤمن” is the subject of the verb and “ربه” is the object of the verb with a “هاء” pronoun attached to it in a genitive case. The pronoun serves as a possessive pronoun.