مُسْنَدُ أَحْمَدَ
Musnad Ahmad 2091
Musnad of 'Abdullah bin al-'Abbas bin 'Abdul-Muttalib from the Prophet
It was narrated that Ibn 'Abbas (رضي الله عنه) said: A caravan came to Madinah and the Prophet (ﷺ) bought something from it and earned a few Ooqiyyah (by selling it), which he shared out among the widows of Banu 'Abdul-Muttalib, and he said: "I shall never buy anything for which I do not have the price.”
Musnad Ahmad 2093lts isnad is da'eef]