If the people of knowledge had safeguarded knowledge and placed it with those worthy of it, they would have become the leaders of their age through it. But instead they offered it to the people of worldly power in order to gain from their worldly goods, and so they were debased in their eyes.I heard your Prophet ﷺ say, "Whoever makes his concerns into a single concern, the concern of the hereafter, Allah will suffice him in the concerns of his worldly life. But whoever lets his concerns scatter across the various states of this world, Allah will not care in which of its valleys he perishes."
حدثنا علي بن محمد والحسين بن عبد الرحمن قالا حدثنا عبد الله بن نمير عن معاوية النصري عن نهشل عن الضحاك عن الأسود بن يزيد
لو أن أهل العلم صانوا العلم ووضعوه عند أهله لسادوا به أهل زمانهم ولكنهم بذلوه لأهل الدنيا لينالوا به من دنياهم فهانوا عليهم سمعت نبيكم ﷺ يقول من جعل الهموم هما واحدا هم آخرته كفاه الله هم دنياه ومن تشعبت به الهموم في أحوال الدنيا لم يبال الله في أي أوديتها هلك
[Its chain of transmission is extremely daif] It was reported by Ibn Abu Shayba, and Busiri graded it daif.Nahshal bin Saeed is discarded, Ishaq bin Rahawayh accused him of lying (see also, no. 4106).