إِذَا جَاءَ نَصْرُ اللَّهِ.
Translation: When Allah’s help comes.
Jāʾa is a perfect-form verb. In an idhā clause its interpreted reference is future, so verbal morphology and the clause’s temporal reference should not be confused.
Book example: إِذَا جَاءَ نَصْرُ اللَّهِ
When Allah’s help comes.
Idhā: future-time adverb conveying condition; jāʾa: perfect verb; naṣru: nominative subject and muḍāf; Allāhi: genitive complement.