Was the Prophet (peace be upon him) liable to forgetfulness?
Yes, the Prophet (peace be upon him) was liable to forgetfulness. However, Allah (Exalted be He) alerted him when the matter was related to the Shari`ah. It was narrated in the Two Sahih (authentic) Books of Hadith (i.e. Al-Bukhari and Muslim) on the authority of
Ibn Mas`ud (may Allah be pleased with him) who reported Allah's Messenger as saying,
I am a human being like you and liable to forget like you, so if I forget remind me.
When he unintentionally missed some of the acts of `Asr Prayer.May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.