Musnad Ahmad 30:130

Sufyan narrated to us, al-Zuhri narrated to us, from Sa’id ibn al-Musayyib, from Abu Hurayrah, that the Prophet (peace and blessings of Allah be upon him) forbade that a resident should sell for a bedouin, or that they should engage in Najash (bidding up the price without the intention to buy), or that a man should propose to the proposal of his brother, or that he should sell over the sale of his brother. And a woman should not ask for the divorce of her sister in order to empty what is in her dish or her vessel, but rather she should marry, for her provision is only upon Allah.