Imam al-Shafi'i (may Allah have mercy on him) said: "The view that Ata' (may Allah have mercy on him) held is that the expiation of an oath suffices him in this (case). Whoever holds this view has said the same about everything in which he breaks his oath, except freeing a slave or divorce. This is also the view of Sayyidah Aishah (may Allah be pleased with her), and the view of a number of the Companions of the Prophet (peace and blessings be upon him) (may Allah be pleased with them)."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الأيمان / Q20036