Lady Umm Hani (may Allah be pleased with her) narrates: The Noble Prophet (peace and blessings be upon him) said: "A person who is observing a voluntary fast is entrusted with his own decision (the narrator is in doubt: 'Ameer', meaning he is the master of his own will); if he wishes, he may continue fasting, and if he wishes, he may break it." There is a difference of opinion regarding the narration of this from Simak. Simak heard this hadith from the son of Lady Umm Hani (may Allah be pleased with her); and Allah knows best.