Mussah al-Azdiyyah said: I performed Hajj and then went to Sayyidah Umm Salamah (may Allah be pleased with her). I said: O Mother of the Believers, Samurah bin Jundub (may Allah be pleased with him) orders women to make up the prayers of menstruation. She said: They are not to make them up. One of the wives of the Prophet (peace and blessings be upon him) would sit in nifas for forty nights, and the Prophet (peace and blessings be upon him) did not order her to make up the prayers of nifas.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحيض / 1608