Musnad Ahmad 9:16

Yazid ibn Harun narrated to us, Ibn Abi Dhi'b informed us, from al-Harith ibn 'Abd al-Rahman, from Abu Salamah, that Marwan said: "Go and reconcile between these two," referring to Sa'id ibn Zayd and Arwa. Sa'id said: "Do you see me as having taken anything of her right? I bear witness that I heard the Messenger of Allah, peace and blessings of Allah be upon him, say: 'Whoever takes a span of land without right, it will be circled around his neck from seven earths. And whoever takes a client of a people without their permission, upon him is the curse of Allah. And whoever seizes the wealth of a Muslim man by an oath, may Allah not bless him in it.'"