Assalamu aleikum

My signature is a proverb (that's what I know), I don't know who said it, but I'll look for it.
And nice to have you in my friends list my sister.

Assalaamu aleikum sister!
I was wondering if u know the source of the saying u have in ur signature (If u teach a man its as if u teach one person,...). Is it from a hadith or from a famous A3lim?
I hope u can help me with that inshaAllah. May Allah reward u.
Jazaki Allahu kheiran
wassalaam