Its chain of transmission is sound.
Ayub narrated from Nafiʿ, who said: “Muʿawiyah sent Ibn ʿUmar one hundred thousand, and the year had not elapsed before not a single dirham of it remained with him.” (1)
Maʿmar narrated from al-Zuhri, from Hamzah ibn ʿAbd Allah, who said: “Had a great quantity of food been with my father, he would never have eaten his fill so long as he could find someone else to feed. Ibn Mutiʿ visited him and, seeing how thin he had become, spoke to him. He replied, ‘Eight full years have passed over me in which I have not eaten to satiety even once’—or he said, ‘except once.’ ‘And now you want me to eat my fill when nothing is left of my life but the thirst of a donkey.’” (2)
Ismaʿil ibn ʿAyyash reported: Mutʿim ibn al-Miqdam told me that al-Hajjaj wrote to Ibn ʿUmar: “News has reached me that you seek the caliphate; yet the caliphate is unfit for one who is dull-witted, miserly, or given to jealousy.”
Ibn ʿUmar wrote back: “As for the caliphate you mentioned, I have not sought it, nor does it concern me. As for dullness: whoever has gathered the Book of Allah is no dullard. Whoever pays his zakah is no miser. And the matter over which my protective jealousy is most intense is my own child—that another should share him with me.” (3)
Hushaym narrated from Yaʿla ibn ʿAṭāʾ, from Mujahid:
“Ibn ʿUmar said to me, ‘For Nafiʿ to retain knowledge with your precision is dearer to me than owning a single counterfeit dirham.’ So I said…"