I am looking for a Hadith in which it says that the Prophets have the greatest burden, then the ones most like them, then the ones most like them.
The Hadith can be found in Ibn Maja, Darimi etc. for example it is the Hadith # 1562 in Tirmidhi:
When the Prophet May Allah's peace and praise be on him was asked which people suffered the greatest affliction, he replied, "The prophets, then those who come next to them, then those who come next to them. A man is afflicted in keeping his religion. If he is firm in his religion his trial is severe, but if there is weakness in his religion it is made light for him, and it continues like that till he walks on the earth having no sin."