It is better for you not to do it, No soul that which Allah has destined to exist, but will surely come into existence." Bukhari vol.3 book 34 (Book of Sales i.e. Bargains) ch.111 no.432 p.237.
Ni vema kwako kutokufanya, Hakuna nafsi ambayo Allah ameifanya kuishi isipokuwa itakuja kuishi." Bukhari juzuu ya 3 kitabu cha 34 (Kitabu cha Mauzo, yaani Majadiliano ya Bei) sura ya 111 na.432 uk.237.