"On Children" was written by Kahlil Gibran (1883-1931). It is from The Prophet, published in 1923. It was set to music in 1981 by Ysaye M. Barnwell of Sweet Honey in the Rock.

I've found recordings by:

Sweet Honey in the Rock: https://www.youtube.com/watch?v=kYAkcL36aCE

Roy Bailey: https://youtu.be/qOofOvCaF6Q

MUSE Cincinnati Women's Chorus: https://youtu.be/IMt6jIYiOvs

Temple University Women's Chorus: https://www.youtube.com/watch?v=BJRAVnnW2hY

The Flirtations: https://www.youtube.com/watch?v=BJRAVnnW2hY

Damien Rice (different melody): https://www.youtube.com/watch?v=5g0RZh0GlgQ


And that's not all.