Imam Ali (AS) said, Ask me [about what you need to know] before you lose me, for verily I am more aware of the ways of the heavens than you are of the ways of the earth.
Nahj al-Balāgha #910[The knowledge of the successor (wasi), his challenge “Ask me before you miss me” and prophecy about the Umayyads :] O people! ask me before...