Ibn ‘Abbas reported God’s messenger as saying,“Some among my people will become learned in religion, will recite the Qur’an, and say that they will go to princes and get some of their worldly goods, but withdraw from them with their religion. That cannot be; for, as what is gathered from tragacanth trees consists only of thorns, so what is gathered from drawing near to them consists only of . . . ”Muhammad b. as-Sabbah said that he obviously meant“sins." Ibn Majah transmitted it.

‘Abdallah b. Mas'ud said:If the learned were to guard learning and entrust it to those who are worthy of it, they would thereby, rule their contemporaries. But they have bestowed it on worldly people to get thereby some of their worldly goods, and have been despised by them. I heard your Prophet say, "If anyone makes the care of his eternal welfare the sum total of his cares God will protect him from worldly care, but if he has a variety of cares consisting of matters related to this world God will not be concerned in which of its wadis he perishes.”Ibn Majah transmitted it,

and Baihaqi transmitted it in Shu'ab al-iman from Ibn ‘Umar beginning with "If anyone makes the care.”

Al-A‘mash reported God’s messenger as saying, "The calamity which affects knowledge is forgetfulness, and wasting it is to convey it to those who are unworthy of it.”Darimi transmitted it in mursal form.