욥기 12:20의 Quotation

And the matter is in accordance with the words of the Zohar on "And Avraham was old, advanced of days" (see there). In order to explain the matter lucidly, as the Rabbis told in regards to Barzelai the Geladite who was eighty years old and said "Can I tell the difference between good and bad? Can your servant taste what he eats and drinks?" And the Rabbis said "He removes the speech of men of trust and takes away the understanding of the aged"