Musannaf Ibn Abi Shayba 9:285

Hafs narrated to us, from Ash'ath, from Ibn Sirin, from Shurayh, who said: A man married a woman with a deferred dowry and an immediate one, to be paid upon ease. She brought him before Shurayh, who said: "Direct us to the 'ease' so that we may take it for you."