Abu Karayb, Muhammad bin al-'Ala' محمد بن العلاء - أبو كريب · Chapters on Knowledge

that the Messenger of Allah (ﷺ) said: "Whoever goes out seeking knowledge, then he is in Allah's cause until he returns."

"There was a man among the Ansar who would sit with the Messenger of Allah (ﷺ), and he would listen to the Ahadith of the Prophet (ﷺ) and he was amazed with them but he could not remember them. So he complained about that to the Messenger of Allah (ﷺ). He said: 'O Messenger of Allah! I listen to your Ahadith and I am amazed but I can not remember them.' So the Messenger of Allah (ﷺ) said: 'Help yourself…

That the Messenger of Allah (ﷺ) gave an address. So he mentioned a story in the Hadith, and Abu Shah said: 'Have it written for me O Messenger of Allah! So the Messenger of Allah (ﷺ) said: 'Write it for Abu Shah.'"