Quran 36:69 — Y.S. (Ya Sin)

What we taught him (the messenger) was not poetry, nor is he (a poet). This is but a formidable proof,* and a profound Quran.

[36:68] Whomever we permit to live for a long time, we revert him to weakness. Do they not understand?

[36:70] To preach to those who are alive, and to expose the disbelievers.