the Prophet ﷺ said concerning a man who declared Zihar upon his wife having intercourse with her before compensation: "Let him offer one expiation." (Using translation from Ibn Mājah 2064)
عَنِ النَّبِيِّ ﷺ فِي الْمُظَاهِرِ يُوَاقِعُ قَبْلَ أَنْ يُكَفِّرَ قَالَ كَفَّارَةٌ وَاحِدَةٌ