´Anas bin Malik narrated that that the Messenger of Allah(s.a.w) said:` "This is the son of Adam, and this is his life-span." And he placed his hand at the (height of the) nape of his neck, then he extended it (higher) and said:" From there is what is hoped for, from there is what is hoped for."
Hadith Referenceسنن ترمذي / كتاب الزهد عن رسول الله صلى الله عليه وسلم / 2334
´Abu As-Safr narrated that 'Abdullah bin 'Amr said:` "The Messenger of Allah (s.a.w) passed by us while we were repairing a hut of ours, so he said: 'What is this?' We said:"It has become weak, so we are repairing it.' He said: 'I do not think but that the matter (of life) is more in fleeting than that."
Hadith Referenceسنن ترمذي / كتاب الزهد عن رسول الله صلى الله عليه وسلم / 2335