(And if you fear) meaning: if you know (a breach between the two of them) Al-Hasan said: It means: if she persists in her defiance until
﴿وَإِن خِفْتُمْ﴾ ﴿علمْتُم﴾ (شقَاق بَينهمَا﴾ قَالَ الْحسن: يَقُولُ: إِن نشزت حتَّى