Sayyiduna Ibn Umar (may Allah be pleased with them both) narrates: We were sitting with the Prophet (peace and blessings be upon him), and the sun was over Qu'ayqi'an after Asr, when he (peace and blessings be upon him) said: "Your lifespans compared to the lifespans of those who have passed are only like what remains of this day compared to what has passed of it."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 13462