Al-Shafi‘i and Zufar require ghusl before intercourse even after bleeding ceases. The Qur’anic expression حَتَّى يَطْهُرْنَ فَإِذَا تَطَهَّرْنَ
Meaning: Until they become pure, then when they purify themselves.
is part of their evidence. The Hanafi distinction relies on the certainty that menstruation cannot extend beyond the completed ten-day maximum.