Hazrat Shaikh Moulana Muhammad Zakariyya (rahmatullahi ‘alaih) once mentioned:

I always reflect over the fact that death is inevitable. Each person knows with certainty that death will overtake him one day. Why is it that people are still so unmindful about death and hence do not prepare for it? Today after Asr salaah my neighbour had passed away. May Allah Ta’ala forgive him and have mercy on him. He had just performed his Asr salaah and sat down in order to recite the Quraan when death had overtaken him all of a sudden. No one knows at which moment death will strike. One is unaware whether one will live to see the next day or even the next hour. I took a great lesson from the death of my neighbour. He was a pious man who was bay’at to my respected uncle Moulana Muhammad Ilyaas (rahmatullahi ‘alaih). (Malfoozaate Hazrat Shaikh 1/134)

Source: Ihyaauddeen.co.za