691 — The trustworthy al-Hasan ibn Saʿīd al-Bāhilī related to me, saying: ʿAbd Allah ibn al-Mubārak—may Allah have mercy on him—never uttered the like of these two lines:

“Keep watch over your tongue, for the tongue is swift
to bring about a man’s death.
The tongue is the heart’s courier …
revealing to men the measure of its owner’s mind.”