Musannaf Ibn Abi Shayba 33:85

Abu Mu'awiyah narrated to us, from al-A'mash, from Shaqiq, who said: Mu'awiyah entered upon his maternal uncle, Abu Hashim ibn Utbah, to visit him [during his illness], and he wept. Mu'awiyah said to him, "What makes you weep, O my uncle? Is it a pain that distresses you, or is it a craving for the world?" He said, "No, it is neither. But the Prophet, may Allah bless him and grant him peace, made a covenant with us. He said, 'O Abu Hashim, it may be that wealth will reach you, which will be given to people. So, it is sufficient for you from the gathering of wealth [to have] a servant and a mount in the way of Allah.' And I see that I have gathered [more than that]."