Musnad Ahmad 30:3309

Ibn Numayr narrated to us, Ubayd Allah narrated to us, from Abu al-Zinad, from al-A’raj, from Abu Hurayrah, who said: "The Messenger of Allah (peace and blessings of Allah be upon him) forbade *al-shighar*." And *al-shighar* is for a man to say to another man: "Marry me your daughter and I will marry you my daughter," or "Marry me your sister and I will marry you my sister." He said: "And he forbade the sale of *al-gharar* (uncertainty), and [he forbade] the pebble sale."