Reference: Siyar A’laam an-Nubalaa – Volume 17, Page 405
al-Qaadhee Husayn narrates regarding al-Qaffaal – his teacher, that many-a-time he would become tearful whilst teaching; he would then raise his head and say:
We have not become neglectful of that which is required of us.
He died in the year 417H, at the age of 90 years.