Is memorizing Surat Yusuf, while forgetting some of its verses when reciting it from memory, considered fulfilling a vow?

Whoever has memorized a Surah from the Quran has fulfilled their vow, even if they later make mistakes or forget some parts, because this is natural and happens to most memorizers, and it can be remedied by regular revision, as the Prophet said: "Take care of the Quran, for by Him in Whose Hand is my soul, it is more liable to escape than camels in their halters."