Ḥabīb Abū Muḥammad (رَحِمَهُ اللهُ) said:
“Do not sit unoccupied (i.e. without doing anything beneficial) for, verily, death is seeking you.”
Source: Az-Zuhd (p. 46) of Ibn Abī ad-Dunyā
Translation source: www.MuSunnah.com