Riyad as-Salihin

'Abdullah bin 'Umar (May Allah be pleased with them) reported: Messenger of Allah (ﷺ) took hold of my shoulders and said, "Be in the world like a stranger or a wayfarer." Ibn 'Umar (May Allah be pleased with them) used to say: When you survive till the evening do not expect to live until the morning; and when you survive till the morning do not expect to live until the evening. While in good health (do good deeds) before you fall sick; and while you are alive (do good deeds) before death strikes.

[Al- Bukhari].