With regards to the student of
knowledge being the foremost to put his knowledge into practice, the scholar Muhammad ibn Saalih al Uthaimeen رحمه الله stated:
What is the benefit of knowledge which the person does not act upon? There is NO benefit in it – rather it will be something harmful for the person.
By Allaah, the ignorant person is better than the person of knowledge who does not act upon his knowledge.
So the proof has been established against the person of knowledge who does not act (upon his knowledge) and the excuse has been cut off for him.
So, sometimes the ignorant person learns
(something) and (then) acts; but as for the man who is a person of knowledge
but he does not act, then his knowledge is a harm for him. Therefore the
Prophet صلّى اللَّهُ عليه وسلّم said: