Maliks Muwatta Book 1, Hadith Number 24.
Section : The Times of Prayer in General.
Yahya related to me from Malik from Nafi that one time Abdullah ibn Umar fainted and lost his senses and he did not make up the prayer.
Malik commented, “We consider that that was because, and Allah knows best, the time had passed. Someone who recovers within the time has to pray.”