Abu Dawud said: The correct version says si: One dinar or half a dinar. Shu'bah (a narrator) did not sometimes narrate this tradition as a statement of the Prophet (ﷺ).
In-book : Book 1, Hadith 264
English translation : Book 1, Hadith 264
1. Purification (Kitab Al-Taharah)
باب فِي الْحَائِضِ لاَ تَقْضِي الصَّلاَةَ