Musnad Ahmad 27:946

Surayj ibn al-Nu‘man narrated to us, Hushaym narrated to us, Yunus ibn ‘Ubayd informed us, from Nafi‘, from Ibn ‘Umar, who said: The Messenger of Allah (may Allah bless him and grant him peace) said: "The procrastination of the wealthy is an injustice. And if you are referred to a solvent person, then follow him. And there shall be no two sales in one."